When you call people ignorant, you are trying to say you know better than them. It is not only rude, but against guidelines.

Certainly some people know better than some other people, and I see nothing in the guidelines that say otherwise, or say that one cannot say so ... expertise is a thing. OTOH, I think there are several aspects of your comment that go against the guidelines. (Perhaps my pointing that out does as well.)

Of course, one can dispute specific claims, with facts and argumentation.