Eat a balanced diet and stop stressing about specifics. Eat meat sparingly. Don't drink at all and it'll make a bigger difference in your life than seed oils. Drink in moderation if you can't handle that. Have fruits and veggies daily, as fresh as you can get them. Walk a few miles a day.
All the basic easy stuff is the most effective. There are no tricks, shortcuts or gotchas.
Getting high to avoid sobriety daily is quite bad as well. Close to that of alcohol. Certainly worse if you are eating edibles fault compared to a beer once or twice a week.
They're higher in inflammatory fats (most seed oils are predominantly composed of omega-6 polyunsaturated fats/inflammatory fats). While our bodies do need some inflammatory and anti-inflammatory fats (sort of like we need Cholesterol) we do not need too much. Calling them toxic is a step too far, but all foods should be consumed in moderation.
"While it’s important to reduce chronic inflammation in our bodies, inflammation does serve us in notable ways, and we actually need some of both kinds of fats. (When we experience physical, chemical, or heat trauma, the inflammatory response that our bodies carry out helps prevent damage from spreading to nearby tissues, works to remove cellular waste and pathogens, and springs the healing process into action.) "
In fact, not removing cellular waste is bad.
What we don't need are the excessive servings we currently get. If people eat a bottle of aspirin, it will likely kill them, but there's no need to label aspirin as toxic, if taken in moderation.
Nothing wrong with them, but a lot of "alternative medicine" special interest groups wants you to believe there is, as evidenced by a lot of the links uncritically posted in this very thread alone.
The main issue is oxidative stress caused by Omega-6 fatty acids. Omega-3 are anti-oxidants and reduce stress. The ratio of o3/o6 is helpful in seeing how it can impact your body.
There is a small, but growing, body of research linking consumption of seed oils with metabolic problems (diabetes)
For people who are concerned about oxidative stress, they tend to cook food in fats, and avoid seed oil issues all together. Olive oil is a good seed oil, but getting a unadulterated pure source is problematic.
I found this post immensely helpful in describing the science behind the health effects of seed oils. But it remains to be said that saturated fat doesn't seem like the best thing for you either. I use the mostly unsaturated oil olive oil nowadays.
It wasn't too bad before in my opinion but this year there was a big drought in the Mediterranean and now it's extremely expensive. Even butter is cheaper than olive oil now I'm afraid... I just try to use less of it. Speaking of butter there are
now a few big studies out there showing that milk fat is not as bad as the saturated fats found in meat. But they are all funded by dairy companies so I don't know if I can really trust them. It's hard navigating the world of fats and health. Fats are good for you but it's hard to know which ones are the good ones.