Karl Poppers theory of falsification is nonsense and not taken seriously by anyone at all serious. Please leave him in the grave and not use his mistake to justify your intolerance.

Said differently:

"The virtuous are virtuous even when they act without virtue so long as the subject of the abuse also lacks it"

No they aren't. The whole point of being virtuous is doing so in the face of evil. If you equate tolerance with virtue you end up at the same place. Tolerance is only valuable in the context of intolerance.