A big part of the problem is that alienation is at the core of a capitalist society. Capitalism actively discourages people from simply handing out together, and enjoying life. You're always supposed to be hustling or consuming, all your relationships have to be transactional, and so on. So, toxicity kind of just falls out from people growing up in this fucked up dehumanizing system.

I think creating events where people can just hang out and chat with each other could be a good start. It doesn't have to be about anything in particular. Just sort of meet the neighbours or meet the community type thing. People need a bit of help in order to start being better to each other.