This is an interesting tangle of illogical thinking. "My body my choice" is generally used with abortion debates. Regardless of one's opinion on that issue, it is clear that the decision taken only affects the person concerned (and their gestating human). However, "my body my choice" in this context doesn't just affect the person deciding, but others. Yes, it is your body and your choice. But it is also the University's choice to only allow vaccinated people on the premises, in the interests of stopping a dangerous virus. Your freedom to choose cannot override their freedom to choose to take reasonable precautions. Unless there is a clear and compelling medical reason why one shouldn't get vaccinated (and in such cases, I'm sure exemptions could be made), it is better to simply get the vaccine (I refuse to even entertain the lunatic conspiracy theories doing the rounds on this one).