Online communists frequently let perfect be the enemy of the good. Many of the people yelling at you online (not all!) have never participated in any form of boots-on-the-ground activism, never done mutual aid, never attended a protest. Given that a solid majority of these people who get very loud online are slacktivists, I wouldn’t worry too much about what people say online. Go out there, do real praxis, and advocate for what’s right.