I'm not so sure about "emotionally and mentally stunted incels," but homophobia, racism, and sexism were all acceptable in the past, and given enough time will most likely be acceptable in the future.
Progress is a lie; change can go in all directions. It's a mistake to draw a line across living memory or the recent historical era and extrapolate whatever trend you find very far into the future.
This may be unpopular topic, but I actually think having a non-traditional sexuality/gender is the new 'edgy'. I know that implies it's just a trend/fad and not a reality for some individuals. It seems to have increased in such a massive relative basis that I can't help but think it actually is a trend versus following some natural occurrence. Or perhaps, given significant hindsight I could see that the definitions around these things is just undergoing an accelerating foundational shift. We know ancient societies had massively different ideas for what was and wasn't normal. Hell, very recently ago our own society had very different norms for age of consent and age of "child".
Sorry if any of this is or sounds offensive, I look at it from a statistical mindset and what baseline seems to have existed. It's totally possible that societies around the world have used religion and such to suppress the baseline and it's starting to naturally come back - I wouldn't be able to observe things like that.
Being LGBTQ is a lot more accepted today than it was 20 years ago. Fuck I could set my pronouns on my linkedin profile of all places.
If a man has long hair, it is looked as a style and is completely acceptable unless you are in the military.
This list implies that "homophobic, racist, sexist, emotionally and mentally stunted incels" is destined to be normal and acceptable in the future. That sounds awful.