I agree somewhat but the solution is tricky. You've described two problems, actually: 1) Community norms/culture and 2) censorship/banning. Ideally, the "next Reddit" would/should allow flagging content that is hateful/hurtful while providing a sensible (and formally regulated) means to appeal flagging, censorship and banning.

Ultimately, the Internet at large needs to grow past this adolescent stage that yields to mob rule and crudely divides people and ideas into "good" and "bad" without any discussion or nuance.