The problem being it never justifies reacting with pure insult-flinging rage no matter what the revelation is. You don't tell people to eat shit because a character got revealed as something. Or at least, you shouldn't.

At least I'm guessing that's the point the image here tries to make.

I mean, true, but this image doesn't feel like it was made with kindness in mind, it feels more like it's trying to be petty and get "revenge" by showing how the other side isn't any different. Both sides being vindictive is hardly a solution.
As a sidenote, people who say "I don't care but…" usually care.