I don't like people drafting off of me unless it is an organized ride. I don't draft off of strangers because I have no idea what their riding skill is - and as it has been said before - if I touch his (or her, but we are so much better riders than men ) wheel, I go down.

OTOH, I don't mind riding side by side & chatting with somebody for awhile. It is fun to see what other people's goals are, what they like in bikes, etc. I've found that the people who appear to be slugs are usually the really strong riders & visa versa.