Banning him isn't the answer. Ridiculing him is far more appropriate.

If we ban him, it means there is something in what he says that we see as a threat, bolstering the bigotry of the low intelligence creatures who support him.

People who express any bigotry inspired incitement to hatred need to be exposed, laughed at and their opinions condemned and dismissed. Just as we do with homophobia, misogyny and racism. Banning them makes them feel they must be on to something.