Because it's the type of stuff a diva would try to get at a concert venue or backstage.
But whatever, players can demand a lot of things. Players can be entitled whiny bitches and nobody would be harmed. It's when TOs start listening and think the type of behavior Smashers are exhibiting are justified and warranted and give in the demands that people should be worrying. Here's an Arizona Smash TO saying it's A-Okay in his opinion.
I have pretty much stop caring about Smash because its players are a bunch of people I don't want to associate with, seeing how the players, TOs and scene are acting, I made a good decision.
https://www.reddit.com/r/smashbros/comments/5072zd/why_is_top_player_privilege_so_acceptable_in_the/
Edit: As for "Why does the FGC care?" question. I'm not sure FGC people care. They're just gawking at the carnage and wondering what the fuck is happening. Now if Smashers start demanding some of this stuff at FGC events, then you will see a lot more people being actively and seriously involved, and a lot more pushback. If you thought Jebailey was brutal towards Melee players after CEO, imagine that coming from each about every FGC TO. They will not put up with this bullshit.