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.
I actually agree with this fully...obviously we should do what we can, where we can. My beef (pun totally intended) is when folks pretend like doing one specific thing matters more than doing any other specific thing. Not everyone has the same situation, not everything is as easy as "just do it!!", and ultimately "doing less capitalism" is not the same thing as "getting rid of capitalism."
I have nothing but repsect for vegans, or for anyone trying to do better in whatever way they can. I too try to do better in my own way when I can; I shop only at union stores when I can, I attend local community meetings, I try to minimize my waste, I care about my carbon footprint and try to minimize it, etc, etc...there's tons of things we each can and should do. But attacking someone for not doing a thing that any individual thinks is "easier" or "more impactful" is just a complete waste of everyone's time. That's what gets me down.