Fuckcars is a very toxic community. Not just this one on lemmy. Online bicycle activists are like vegans, actively turning people away from an objectively good lifestyle because they're just such giant sanctimonious dicks about it.
Many communities have some number of jerks. I actually find that people constantly stereotype based on outliers they hear about online. I've met very few vegans who were normal, reasonable prople, yet I've met very many people who steteotype and hate on vegans despite knowing none.