As far as I know, the only federal mandates they have to accept are the ones in Title VI of the Civil Rights Act of 1964 and Title IX of the Education Amendments Act of 1972. These basically just forbid discrimination based on race or sex.

Hang on, I am going to ignore the topic at hand and spend the next 4-5 weeks to discuss every possible constitutional /anti-constitutional scenario just to please you.

sorry for the sarcasm but he keeps going

I'm not the one who insisted taking a "penny" meant "the government can force them to do almost anything."

This is an absurd principle, and you've offered little but snark to defend it.

You take advantage of government largess every time you drive on a Federal highway. That doesn't mean the government can make your travel on that highway contingent upon giving up completely unrelated rights.