Is my Mom Super Evil or Funny and I just don't get Her Humor?

I'm 18 and have always been on the smaller nerdier side of the scale, My Mom would be considered by todays standards and highly succesful sought after attractive lady! My problem is...she acts like a bully! Now granted..she doesn't abuse any of us and she provides very well for us and would never say NO to us, but she's a bully! I'll give you an example...when me and my friends are play wrestling I always get held down cuz im the smallest, they then ask my Mom to fart on my face, 100 percent of the parents in the world would NOT consider this...EXCEPT...yea you got it..my Mom does this whenever she's darred. Everyone laughs about it and its like a big joke. So...am i a prude and don't have a humorous side or am I right in saying I don't like to be (pardon the pun) of the joke!?!?