YSK: On the internet you can just freely say what you really think even if you know it's unpopular.
This isn't your college or work place break room. If people are saying something you disagree with you can just say it and you won't be fired or ostracized for it. Yeah, people will probably get angry and say mean things to you but those are just words which can be ignored. Offence is taken, not given.
This is mostly for the lurkers who upvote unpopular opinions but don't comment. You can speak up - you're not alone.
Your anonymity will only hold until you have pissed of someone dedicated to track you down.
And some people do not need much information to do just that. Stories online include finding a location based on the reflection in someones eye or finding a address in London based on a single picture of the window taken from the inside.
Of course you can just not post real pictures and be careful with any details but just the topics you talk on and the hours you are active can give you away.
In the end it doesn’t matter how much actual effort you put in obscuring your real identity, one slip up being found is enough to get the ball rolling. And if people hate you they will gladly keep it rolling.