I do not like group rides, I've only done a few. It's been at least 5 years since my last one.
There is a local group that does a no-drop ride on Mondays. My wife did one and loved it, she asked me to go. I went.
There were only six of us. One lead, one was the sweep, my wife and I rode single file, then there were two women, both very experienced, who rode side by side the whole time.
They even rode side by side when cars were trying to pass, and the sweep would yell, "Car back," and "Ride single file."
I will not ride with them again. I am not the perfect cyclist in regard to cars, but I try my best to be courteous and not have them hate cyclists more than they already do.