I understand the humour in the riposte...my adolescent children use the same phrase all the time, and it can be very amusing when used in the correct context, unfortunately, it is also true. So, forgive me if I don't laugh this time.
On a brighter note...written anything else we can tear the arse out of? Post it, post it....
I think you have taken this all very well and in the spirit it was intended. I am impressed. You are far braver than I am. Mind you, to write like that, you have to be!