All too common. That’s why I photo and spearfish solo when I can. People and bubbles can really wreck critters behavior. Just a fact of life on most party boats.
But, to be fair, I’ve made a lot of good long term diving buddy relationships with horrid divers in those types of situations that gained experience and at this point would be hard to replace as go to buds. Expectation management and tolerance go a long way ;)
But, your argument is super valid and needs to be heard. Hopefully it will smarten up a few peeps. I’ve had my mask and reg kicked off by photo journalist underwater when I was clearly there first setting up a shot.
PS: flailing a speargun all over the place tends to keep the smarter ones out of your way...