Which is why the default reaction shouldn't be offense
If someone doesn't recognize it as relatively harmless banter (which may be a matter of opinion anyway), then why would they not think it's inappropriate here, when this forum is known for being more civil than most, partly for the reason rituch gave?
The "default" should be to recognize that misunderstandings happen online, and to definitely not post a rude, redundant comment like "get real" to an already heavily downvoted post that two other people have already addressed.
Edit: Well, judging by the down and upvoting, it seems I'm in a minority, or a lot of 'free speech' warriors here don't understand the concept of private forums with rules, and think posts simply telling people to "get real" add to a discussion.
Stop being wild, muttafuk, we are tryna chill n talk some good shit together
"yo bitch, that's crazy" or "my nigga, that's insane"
These would be deemed unacceptable and rightly so.
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.