We can all do better to call out bad behavior on our side in some cases. But in short, people are “objecting to it when it comes up”. If you’re talking about the thread I’m thinking of (don’t recall the title, but a GD thread a few months back asking if any conservative principles are NOT based on bigotry/hatred/etc.), numerous (liberal/left) posters chimed in with tolerant and broad-minded defenses of conservatism in general and criticized posts that childishly lumped it altogether as fundamentally bigoted and hateful. Your hypothetical doesn’t match, since there were plenty of posters publcly criticizing the simplistic denigration of conservatism.
So once again, I think your characterization of the board is false. Shitty and bigoted posts are usually called out, even when they’re made on the “liberal” side.