Teachers get in more trouble over less than this!!! (eg: he looked at me! - yes this is true- as I had a friend who was accused of this...)
Imagine if I could swear back at every kid who sore at me! We can't just hit or swear at them if the piss us off (everyday) so why should a Policeman be able to?
Professionals need to act like professionals, that's why we get the big bucks (sort of)