Anti-sexist reactions are very rare compared to instances of sexist behavior in my experience. If anti-sexist behavior was as rampant and casual as sexist behavior, those kind of blowups wouldn't happen.
"Calling out" the behavior consistently creates vigilantism, and puts an unfair burden on the accused. In instances of sexism I have never, ever seen the accused treated as "innocent until proven guilty" in the eyes of the online hate mobs.
Tim Hunt's experience was bad enough that he admitted to thoughts of suicide. This is a man fully respected in his field and has a knighthood, but still had difficulty facing the onslaught of hatred.