Ironically, it is exactly those who are intolerant who love to quote Popper as justification for why--because they are opposing the intolerance of their enemies--they get to be supremely intolerant and it's actually a good thing.

Indeed, people quoted it so much that I felt compelled to write a story as a rebuttal, which almost never happens: https://medium.com/@ichoran/there-is-no-paradox-of-hatred-fbc3ddeb2500