Originally Posted by
Ken33xx 
If you've got a friend who continuously harps on the fact you aren't drinking you might consider finding someone else to hang around.
If you've made it clear you're not drinking that should be the end of it. No need to go into any big explanation as to why you're not.
You said no and move on to something else.
Personally, I found I no longer hang out with old drinking buddies. Not because they tried to get me to drink but take away the booze we have little in common.
Normally I don't but it's kind of a catch-22 situation. Our social circles intersect and I'd be avoiding the people I do want to see. It's kinda like a bad divorce except from a wife or husband it's an old drinking buddy.