Most of the items on here should be in the ATC humour thread - and a number of them are centuries old too!!
To get back to the main thread, the worst insult I ever had to endure from a pilot was when I was sitting on Heathrow GMP one day and a Speedbird chap called me "Gatwick Ground" (wherever that is). I mean to say...... dear oh dear..... Had to get the smelling salts out for that.