Demonstrating the absurdity of fascist claims publicly is one of the best ways to take the wind out of their sails and stop their appeal to potential sympathizers
Ridicule has a much bigger effect on these people. They enjoy hate because it's fully what they expect, but to be belittled is a direct attack on their ego.
The poor little snowflakes. Can't they take a joke? It's a free country, people should be able to say or do what they want in their lectures. They're just trying to make sure America isn't destroyed by pansification. Why won't everyone wake up!?