It's only because we think we know what he was thinking.
Guy goes into a bar.
Waitress obviously flirts with him to try and get a good tip.
He responds by tipping her a normal amount.
He feels good because he got flirted with and thinks he rewarded her interest.
She doesn't even realize that he would have been a shitty tipper if she hadn't flirted.
It was totally unintentional, but I honestly think he won that round.
XI Wiki


