I'm firmly in the saddle of my high horse here. When someone takes the trouble to send me an invitation to a party, and particularly when it is someone you know well but don't see very often, it is expected that you will respond in some kind, stating yes you'd be delighted, or no, you either don't want to or can't attend. Either response is fine.
No response is just fucking rude.
Yet 73% of people invited to a party at my house have failed to do this. Despite the fact that a lot of them were invited through facebook and could have just clicked yes or no there and then.
Grrrrrrr! How do you cater for a party if you don't know whether there will be 30 guests or 100?
and AIBU to keep back a supply of senna laced canapes for those buggers who didn't reply but then turn up expecting to be fed?