Is that one of the people who runs one of those anti tankie subreddits?

If so - I’d assume they just picked an anti-tankie position at some point in the incoherent walk through political stances that most people go through, then had a moderately successful subreddit dedicated to it, and “lets me be the head of a moderately successful subreddit” is more than any other political ideology offers, so they stuck with it.