As I say to the occassional student pilot - don't slag anyone off until you are on the ground and the radio is off.
Word of warning young people, sitting in cruise is boring. When someone calls another and says go numbers, 90% will go numbers if they have a spare com just to listen in on something different. Numbers is not a dicreet chat frequency.
I heard from a mate on the grapevine some young guys flew into YJAB about 2 weeks ago in some 172's. There were about 13 pilots listening in on what you where saying. Very immature, arrogant and in some instances offensive (some tuned back out) from what I was told.
Moral is, nothing is dicreet. Always check your radio and make sure that correct frequency is selected, and TX goes away when you release PTT.