I'm going to sound like Dolly (lol) and everyone's mother...but...honesty is the easiest route in the long run. There are no complications and misunderstandings with honesty.
"I'm really sorry, but I've changed my mind, hope you understand."
"I'm not much into the drinking scene, so don't think we'd be a good match."
"I need more time with just me and am simply not ready to date right now."
"I forgot my sister was having open heart surgery this weekend and I just won't be able to make it." okay one little lie to see if you're paying attention haha
Did anyone notice that none of these answers attacked the other person. If he's a jerk (like the guy who smooched with Miss Tubetop) then he's a jerk and telling him won't change him....we all know that, yes?
Keeping it about us leaves no room for debate (am not, are so, am not) and gives it a clean cut.
I think we've all had enough of the games, lies, manipulations, and dishonesty and find the truth a refreshing and healthy change.
Hugs