David Villa was a global celebrity and had been for years, and may, like many such people, feel entitled to behave like that, and invincible. Some people had gaps in their upbringing as far as civility, respect, etc., and that combination with celebrity and groupie-like fans leads to these sorts of situations. That's what I'm thinking. And others in the room go along with it, because it's much easier than standing up to it. Especially someone you admire.
I hope the club takes this very seriously because that behavior has no place in a professional setting. Or any setting.