So if someone wears a shirt with a confederate flag should that person be allowed to attend a university that accepts federal funds?”
I don’t know the answer to that. I suspect in practice the student gets told by the university to take the shirt off or gets expelled.
Such a case has probably been litigated.

The more important question is, do you think a person should be expelled from a school by the government because of the shirt?
I'm asking your opinion, so don't hide.