FWIW, I always try to be friendly, wave at other bikers and ask if they need help on the road. I’ll ride with slower people for the conversation or faster people for the draft, I don't really care.

One time, though, a tri geek got in our group/pace line on a two day event ride. The guy was riding his aero bars in line and was all over the place. I told him to stay out of his aero bars or find another group to ride with. He huffed and left probably thinking I was a snob. The next day, my wife and I rode past him up a hill

-murray