IF you want a certain backdrop or view and someone with a undesirable glamour walks in and ruins the shot (for you) then you would have to change your desirable angle to accommodate for them possibly several times if they're moving. Telling someone "well just don't look at that part of the screen" isn't particularly more of a compelling argument than "don't think about it".
And? Some people are picky. Why isn't this a problem just because you think they're fussy? This doesn't sound any different than someone being absolutely particular about how they appear on others screens. Why do you have to worry about how you appear on EVERYONES screen?
And while I understand there are people out there who don't wish to see things for particularly hateful reasons, there are people out there who just don't wish to see things because they find them unsightly or immersion breaking (lore is very different) . Both very personal things that cannot necessarily be said to be bigotry or intolerance. Why do their particular tastes not matter?