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.

I like that, it's less paradoxical, and likely easier to explain to people with less developed critical thinking skills.

Exactly. Tolerance is an opt-in protection. If you don't opt-in by exercising it yourself, you don't get the benefits.

Or, as a meme: YA_GOTTA_GIVE!.gif