Yes both correct.
There is one gender that are terrible tippers.
And there is one race that is the absolute worst of all for tips.
And we all know who they are.
“There is one gender that are terrible tippers.”
That would be my gender. I think that separates out in to two groups: Those who have been waitresses at one time (me) tip very well. Those who haven’t had that job are pretty bad. Generalities, of course.