Wiki - The paradox of tolerance states that if a society is tolerant without limit, its ability to be tolerant is eventually ceased or destroyed by the intolerant. Karl Popper described it as the seemingly self-contradictory idea that in order to maintain a tolerant society, the society must retain the right to be intolerant of intolerance.
It's only a paradox because the creator of the infographic has oversimplified what intolerance is.
When nazis are intolerant of a minority group, or whatever their target is, are violent towards them.
When the general society is intolerant of nazis, they are not usually calling for nazis to be killed or harmed.
And the creator does not differentiate between how a government deals with nazi versus the people. A government may "tolerate" nazis when it comes to free speech, and then be "intolerant" of nazis when they commit violence, and arrest or prosecute them. The general populace, unlike the government, cannot prosecute nazis (legally), they can only shun them. The creator clumsily does not differentiate between legal consequences and social consequences.
Basically, the infographic creator is trying to both-sides this shit, when one side want ppl dead, while other side just want nazis to go away. They are not the same. Moronic, sophomoric, low IQ. Too bad this may actually work on some people. That's the sad part.