Buddy is in a relationship now but a chick from the past he took out for dinner and split the bill with messaged him saying "i stopped talking because you are cheap and split the bill"

I think he did good by splitting but suggest he should avoid dinner dates as first dates in the future to avoid shit like that.

He was going to respond "because I didnt find you attractive" but I feel that would make him look butt hurt.

Tldr: good response to being called cheap for splitting dinner bill on behalf of a friend?