We do ride in a friendly group so we stay together. If we run into some showboat that latches on then starts clowning around, I will send one of the stronger riders to blow his doors off just to teach him a lesson. So yeah we have fun. Especially when Aimee is in shape we send her ha ha! So it's like a mother ship sending off little fighter planes here and there. The tiderd I'm talking about Pwarbi are the ones who refuse to take the front then sprint around at the end. We had one guy tjst did that like 10 rides in a row. I asked him about it and he said he wanted to show everybody what he had left. I told him if he wanted to prove he was strong he should take the front during the ride. He did after that then endef up getting dropped half wsy through our 40 miler. But the group slowed for him to keep up 2 different times on that ride. He never show boated again after that ha ha!
I know and have ridden with people like your talking about in the past but I don't pay too much attention to be honest and I wouldn't let it annoy me.
In my experience they tend to be the younger riders that don't pay too much attention to the unwritten rules or codes of conduct I'd expect and if they are willing to lead and then fall back in the pack in turn then so be it.