Do you really think insulting can be done in a proper way? Insulting is by its definition inappropriate.
What qualifies as an insult is also determined both by the individual social situation and by changing social mores. Thus on one hand the insulting "obscene invitations of a man to a strange girl can be the spicy endearments of a husband to his wife".
Source:
https://en.wikipedia.org/wiki/Insult.
For me, they're very much appropriate and fun. For you, and some others they may not be. This is why they're part of free-speech; controversy as Loyce said it.