Asking before jumping in a 1v1 is good.
Asking to be left alone if you are in a 1v1 you want to stay that way is good.
Expecting either to happen or be honored in a furball consistently is unrealistic in the MA.
Getting upset about anything that happens in a video game is silly.
When flying against bigger numbers in a furball, generally its accepted that the idea is to clean out as many as possible to even it up. Still nice to ask, but often too busy to expect that to happen.
Everyone in the game has their own set of "rules" and there are too many versions to keep track of. The guy that never gangs might be fine spawn camping. The guy that picks a lot may never want help when he ends up turning in a 1v1, but might be HO'er at every chance. The guy that gangs, picks, HOs, bomb****s, camps, runs, stick stirs, and vulches is often the guy that complains about it the most.
One guy might have fun killing radar and ords, then running home unscathed to continue on some base taking plan. The next guy wants to dive into a sea of red and see how long he lasts. Fly and let fly.