Do you think there are any beliefs which makes a person believing them a horrible person, or is it always 'hate the belief, not the person'?

The CEO of Nestlé has gone on record saying that he believes that all water sources should be privatized.

So, to answer your question, yes.

Though there are a plethora of stronger reasons to hate the CEO of Nestlé.

Belief is a choice, not fact. It's fair to hate a person for choosing bigotry.

Yes, horrible beliefs make a person horrible.

but No, I don't hate someone just because they are horrible. Horribleness is not an immutable property. People are horrible because they lack the ethical skills to be better, and those ethical skills can be taught, including the ability to examine and reject horrible beliefs.

I used to think that believes really don't matter as long as the person doesn't act on it, but almost all believes shape who we are. It starts with little comments and evolves into actions. It doesn't have to be that way if people acknowledge harmful ideas, but if you let someone believe that women are worthless or that their race makes them superior for long enough they will become a bad person.

Neither really. Sort of.

There are certainly inherently repugnant beliefs, but beliefs in and of themselves are harmless - they're just a particular pattern of firing neurons in a brain. They literally cannot bring harm to others just in and of themselves.

The thing that makes some beliefs horrible is not the mere holding of them, but the things one who holds them is likely to do. It's those acts that are the real evil - the beliefs are just a foundation, or a trigger.

Now, all that said, I would hazard that it's exceedingly rare at best (and arguably impossible) for anyone to hold noxious beliefs without them in some way affecting their behavior, so the mere holding of noxious beliefs can certainly serve as a justification for the conclusion that the person in question is in fact horrible. Still though, to be (perhaps overly) precise, I'd say that it's not the belief itself that makes them a horrible person, but merely that the belief makes it quite likely that they'll act in ways that make them (or reveal them to be) horrible people.

All of them. Beliefs are what makes a person good/bad. Any bad actions come from those bad beliefs, but belief must exist first.

Let me give a very simplistic example. Most of us agree that murder is bad. In order for someone to commit murder they must first believe there are some cases where killing another person is justified or even desirable specifically for them. And not commonly agreed on ones like self-defense.

We even encode this difference in laws. Killing with intention is called "murder", while if it's done unintentionally it's a lesser change of "manslaughter". Belief is what decides severity of the action.

Yes, your beliefs shape how you act, so shitty beliefs will make you a shitty person. Not shitty all the time, but shitty often enough that anyone can point at the person and see it's mainly due to the belief.

Some examples: racists, fascists, ancaps

Intentionality is important. If they hold a belief as a means to a ruinous conclusion, I wouldn't blame you if you end up hating the person.

I think it's actions that make a person horrible. You can believe what you like, but as long as you keep those thoughts sealed up in that fetid dome of yours, we're cool.

Yes. The person might be able to change, but at the moment, they're horrible.

Well, yeah, a fascist is a horrible person, and so on. But I don't think "horrible person" is a particularly useful or meaningful category. I don't care if you're a good or bad person; I care what you're doing, what effect you have on other people and on society at large, and if the answers to those questions are negative, is there anything that can be done about it? If a fascist can be reformed, then we should do whatever we can do make that happen. If they're a lost cause, well... I like to believe that no one is a completely lost cause. The solution if someone is truly a lost cause is not particularly nice or humane.

I had a friend who was a great friend in so many ways, she was clever and very helpful when I needed anything, also would ask me for the same when she needed help. She told me once that it's way better to kill someone else, than yourself, because then you have time to repent before you die. What a horrible belief! But it's not like she actually went around killing people, it was hypothetical.

I don't have the answer but the belief did not make her act in any terrible way.

Most people can change their beliefs. However, we don't always have the time, and we aren't ever obligated to entertain stupid beliefs.

people define themselves with their actions. so I will totally hate the people based on how they define themselves.

Hate someone for their actions.

Be suspicious of people for their beliefs.

Avoid people if their beliefs are so concrete and premeditative that you believe they will turn their bad beliefs into actions.

Holding a belief and acting on said belief are very different things.

There are crazies who believe certain types of people they don't like should be exterminated, but so long as they don't act on those beliefs I don't consider it horrible or immoral.

That lies in the reasoning for their conclusion, not what they adhere to itself. You cannot hold a negative quality against someone if it was duped upon them, but it's not like you can't if that part of them is pre-existing.

The only irredeemable people are those that don't return their shopping carts.