I don't want to put a lot of effort into this...but I found 2 national polls, the newest over 10 years old, both of which are extensively criticized at aistm.org for flaws in design and interpretation.
Also in older data, the Seminoles and the Oneida voiced opposition to "indian" mascots, as did the National Congress of American Indians.
And, I found this great illustration: which apparently I can't paste in...so, it shows the following: 3 caps, in team colors...one is the Cleveland Indians, with its familiar caricature; another is the San Fransico Chinamen, with an equally offensive caraciture; the third is the New York Jews, with of course another offensive caricature.
I think extensive research, which I'm not interested in doing, will find that the PC arguments you find laughable have not been debunked.