Please can you help me come up with something to say in this situation...
My DC’s attend an out of school activity where the instructor has recently discovered where we live (not that it was a secret!). Since then he keeps making snide remarks. e.g. about what type of car we must drive-
“How’s the Landrover today”
(We don't have a big car btw not that it should matter either way!)
He also puts on a posh accent and says to us and our kids in front of all the other kids-
“oh you come from Pootletown don’t you?”
Followed by a sneer and a smiley face-as if its a joke.
I just don’t know how to react. It seems so petty but this kind of stuff has always got to me. I just smile normally and said “I wish” to the Landrover comment!
Then I am so annoyed with myself. I can’t bring myself to say anything nasty back because I’m just not like that.
I used to really respect this guy, his knowledge and what he taught the kids so I don’t want to piss him off but I don’t think this is right.
I need to know what to say to shut him up without it being a cheap dig!!
Any ideas anyone? I know I need assertiveness training 
Thanks