As a former , I've learned that the first, best step you can take is learning to tell people to shut up
It can be hard, mainly because we're usually browbeaten into believing that we're supposed to settle things with civility
But the thing is, they're the ones who aren't being civil, they're the ones who don't show anyone respect, they're the ones who will resort to cruelty and bullying
So it's important to remember that even if you don't know everything, you know enough to know that nobody knows everything and anyone who pretends to be the arbiter of absolute knowledge is just being a shit