Probably depends on their background and primary interest. Most tri-folk I know came from a running background. Cycling has never been their primary sport and they're uncomfortable or awkward in group rides. Or they'll do stuff like ride the aero bars while drafting in a group ride. Makes my teeth itch to see that.

But some tri-folk came from backgrounds with at least equal interest in cycling, and some racing or at least fast club rides, so they're okay with riding together.

Personally I never mind if someone wants to follow my wheel. But they'll be disappointed. I ain't that fast.