Twitter is, like any other public space, filled with those you choose to follow and their friends, etc etc. If you follow people who post things you don’t like, we’ll that’s what you get.
I swear I’m not just making this up. I’ll gladly take screenshots of the first 10 pages of my feed anytime and you won’t see anything distasteful. You will see crypto scams and some crypto bros saying nonsense, but that’s no different from walking into a 7-11 in the city. Haha