I tip pretty good. I don’t know about the rest of them.
I have 2 Indian grandmas, so I am part Oklahoma Indian. My observation is from Arizona — Apache, Navajo, etc. Go into a very nice steakhouse, or Mexican place, and all the waitresses are secretly begging the hostess, “Please don’t seat them in my area.” A table of 8 people, with a $200 tab might tip $5, if anything at all.
I am glad that you are the exception to what I’ve observed.