I assume you mean AJRF. Just because those two examples are unacceptable doesn't mean "wow, get real" is acceptable. If you disagree or don't understand why someone said something, then either forget about it, or reply to it for clarification or discussion.

I mean why don't we all just post "get real" to everything or everyone we disagree with? Apparently a surprising number of people here can't think of a reason why not, since they think "get real" a fine response.

Edit: Actually, I think you mean if the "motherfucker" guy had said those things, in which case, I agree. People defending the use of "crazy motherfucker" may indeed be offended by the examples you gave, or feel they are inappropriate here, but can't seem to understand that terms they think are fine may be considered inappropriate to other people.