I encountered this myself after responding to someone's comment about the Universal Basic Income (UBI) concept, and got spammed with negative replies. I figured it was just ardent supporters, bots make sense though given the speed of the responses. Sadly, I think this may be the new normal of politics in the 2020s.
From what I have seen of Yang Gangers, that could very well have been the result of real people. A high proportion of them are always online, highly vigilant, eager to participate in online activism.
Maybe it is, maybe it isn't. The very fact that people are questioning whether political support is real or not the significant problem.