Tolerance is a mutual contract.
and if someone isn't tolerant, they are breaching this contract.
therefore, it's completely fair to be intolerant to the intolerant; they're the ones who broke the contract.
Practical example:
"respect my ideas, and my ideas include not tolerating diversity" -> breach of tolerance contract, does not deserve to be tolerated.
IMHO it's completely fair to demand from people who are demanding tolerance that they're tolerant, because they're doing the exact same 🤷