Yup. This is a well-tread philosophical problem: the Paradox of Tolerance. Greater minds have concluded "to protect tolerance, one has to be intolerant of intolerance."

And, as always, bsky is a place of business - it is not a public venue. They can decide not to admit individuals who would threaten their business.

I have heard it much more aptly described as “enforcing the social contract”.

You agree to uphold the contract of tolerance with everyone that participates. If someone refuses to uphold the contract with others who do, then you have no obligation to uphold the contract with that individual.