Its worse when they try to play match-maker. my word. Friends once tried to set me up with someone and they pushed and pushed and "we've got the date set you'll come over we've arranged it all" you'll be married in no time.
I had to come up with an excuse cause i didn't want to make them feel bad, and said i'm away for work. Which i wasn't going to be cause i was not travelling for work that period lol. so one plane-ticket and a hotel in Cape Town with AVIS car hire later, it was a very very expensive excuse lol
[EDIT: But worth it, i had a great time in Cape Town that was not planned lol]