Semi autos, rifles and pistols throw shells, we all know, or should know that.
There are means to reduce the effect. An example, I shoot rapid fire in the classic prone and setting HP positions. I try to line up my shooting stool to defect the brass.
I may move it if someone on the other side of me is dumping brass that affects me.
I like to direct my brass where it's easier to police but I'm more concerned where the bullet goes then where the brass goes.
Brass flies, it happens, do to the vast numbers of semis out there now we expect to get hit once in a while. We can't keep people from setting up next to us, if we try, then its us that's rude, not the guy shooting. We can't expect people to go home because we don't like their brass.
Its part of the game, try to defect it if you reasonably can, then don't worry about it.