There's no paradox. Although, Karl Popper's words are as good as any.
My point is, no one said "the left have to tolerate everything." In fact, not tolerating capitalism is the defining feature of all left leaning ideologies. More so, where you are on the scale of leftism is based almost entirely on the extent to which you won't tolerate capitalism. Rhetorically, for what possible reason would the left ever have to tolerate nazis, in the first place? Who said they did? Where are they? Of course, no one said they did.
I found it's best to, rightly, just reject the false premise of it being a paradox out of hand. The type who use it know its BS too.
I feel like 37 glasses of water should technically count as drowning