Periodic reminder: Make fun of horrible people for what they do, not their body or their appearance. Many good, kind, and wonderful people exist who happen to share similar physical features with the horrible person you're mocking.
@JessTheUnstill
Mood. It's never okay to chastise, belittle, or insult someone for a trait or characteristic that either a) cannot be changed or b) is irrelevant to the subject matter
If you've got a problem with someone, point at the problem. Anything else is just manipulative.