It doesn't really bother me too much personally...being a short person hasn't had any bad effects on my life to be honest....But it could offend some people who are not very tall...It is like calling somebody overweight a fat bastard...It could not bother some of them but could really offend another person...Would you ever call somebody a fat bastard and laugh at them? I wouldn't personally...
I'm deffo not a very serious person, but I am just thinking of others a bit really because it is the same as the fat example I gave really...If you would call somebody that or sing a song about them then don't take any notice of my momentary moaning at you dude lol.
The whole point of the song is to mock prejudice, not express prejudice. If someone takes offense, that is because the message is flying over their head.
The song is "Short People" by Randy Newman, if you care to look up the lyrics or download it.