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.
Maybe the slavery comparisons are good actually because these threads are like if the abolitionist formed a subculture in the 1800s around not wearing cotton and the ensuing discussion revolved around whether you are in the superior subculture or not.