Don't put him down over that. he wont attack you or more then likely the dog he lives with. If you're upset he'll pick that up and then be tense. If you were already tense at the play date, that's probably why he was on edge himself. Dogs reflect our feelings so take a look at how you're handling it and that will tell you where his state of mind is. Find a good trainer that can help you get past it, the dog will be over it way before you will.