Sweat is not considered a bodily fluid. See: https://medical-dictionary.thefreedictionary.com/bodily+fluid. It doesn't really transmit disease. And since you'd be thrifting in person -- on the very off chance that somebody has sweat enough into a garment to smell without cleaning it, you'd be able to smell before you bought.

I don't know what you're doing with your clothes, but I doubt anybody is selling anything that has been stained with anything else on that list.

But... You know what, you've convinced me, you definitely shouldn't come.