I guess I'm in the minority, I dont see this as rude at all.
They wanted their area lit up, for whatever reason, so they lit it up. They did not break any rules. They even had the lights turned off during "quiet time".
I'm willing to bet they didnt judge you for the way you camped, why should you judge them?
Somethings are annoying, yes. But if they aren't breaking a rule, or being unsafe, then just go with the flow....
I would have probably walked over and said hello. Probably tried to get a free beer out of them
and made some comment about their bright lights within a conversation.
If they were shining into your campsite (which it looks like they may have been) I would walk over and ask them to turn the lights a little or relocate them while explaining that the bright direct light was bothering me. I bet they would have done it without any issue.