We have to do it. Some of us have to do it in different ways. Doing small things where you can is all well and good but literally none of us are making a single impact in capitalism by making different choices about how we're forced to participate in it. Focus on tearing it down together rather than picking apart individual choices because those individual choices still result in participating in capitalism.
Said this to another commenter here, but I never said I wasn’t vegan myself. People of the same ideology can — and should — criticize each other too.
You being vegan makes carrying water for carnists worse, not better. Bully them if you want to help them, coddling them won't change their mind
going back to my original point: “But everyone here will just continue to get mad at each other for each’s own personal choices instead of working to better themselves, because superiority (on both sides) feels the best.”
Then you're doing apologia for people you know do be doing something ethically wrong, which is about the most liberal thing I can think of.