Am gutted for DS (6 but nearly 7) - there have been at least 3 birthday parties recently where kids he considers friends didn't invite him. he hasn't really noticed but I'm devestated, ungrateful little sods. 
They were all invited to his party last year...
His party is coming up - don't want to invite the so-called friends... AIBU???
(think I can get away with the "inviting a v small number of kids to go do something" approach so he doesn't realise...) Not sure that makes it any more reasonable...!