Like, if there's a clearly signalled "Suggest a song" moment, sure, fine. Otherwise STFU. Particularly with big giant bands who a) can't hear you, because there are another 12,000 people in the room, and b) aren't really able to mix up their setlist on a whim, even if they wanted to.
Also, yelling a bandmember's name. Fuck off with that shit. Ezra Koenig is not going to drop his guitar in the middle of the show, and whisk you off to his secret underground sexpalace, no matter how incessantly you shriek his name from 20 feet away in the crowd.