I'd argue it's not a paradox because it relies on two different definitions of tolerance.

• Tolerance 1: Intolerant opinions should be allowed to exist without criminal punishment.
• Tolerance 2: Everyone should treat intolerant opinions like other opinions for the purposes of platforming, how you feel about the speaker, etc.

Tolerance 1 is basically the kind of free speech principles adopted by most democratic societies and is probably necessary for such societies to remain free. Tolerance 2 is just silly. If you're in a forum specifically for debating deplorable opinions, fine. But there's no reason that a politics forum needs to cater to deplorable opinions.