In terms of toxicity, X is way beyond 4chan at this point. But the style is very different. Algorithmic vs organic, retweets vs (You)s, anonymous vs semi-anonymous and much more. All the way to how replies are visually presented which is awful on Twitter and it's clones.
Honestly, I've had more positive interactions and learned more on 4chan than I ever have on Twitter. I wish the few tech people I care about who are still on there would just move (to clarify, move anywhere, not to 4chan obviously).
Twitter has always been one of the most toxic places on the Internet. It's why I have refused to use it, because I have better things to do with my time than watch terminally online people get into diatribes about their extreme left/right political views. I don't have any faith that any replacement will be better, considering that they are primarily populated by the people who are so extreme left that they couldn't abide the idea of new Twitter ownership.
Honestly, I've had more positive interactions and learned more on 4chan than I ever have on Twitter. I wish the few tech people I care about who are still on there would just move (to clarify, move anywhere, not to 4chan obviously).