I have very strong feelings on the concept of "group" rides (or runs). If it's a "group" workout, the group is supposed to stay together unless explicitly stated otherwise. If I'm running with someone faster, I want that person to drag me to running just a little faster than I think I can. If I'm the faster runner, I'm going to try to push that other person out of their comfort zone, but not drop them. Group rides are the same thing: if I'm the fastest, I'll try to do most of the work and provide a good draft. If I'm slower, I'll tuck and hang onto the draft and feel rather salty if I get dropped anyway. Again, this is unless explicitly stated otherwise - I've done out & back shop rides that are polite out/ hell-for-leather back, and everyone knows it and it was covered beforehand if someone new showed up. And that was literally like 14 miles back, so not much of a big deal.

So in short I'm 100% with you on this. If you (impersonal you, whoever else was at this ride) are going to go your speed no matter what, it's not really a "group" ride.