A conservative speaker was attacked by a left-wing protester at a Missouri college campus Thursday for proclaiming that “Men Are Not Women.”

Columnist Michael Knowles, who had been invited to speak by the University of Missouri-Kansas City’s College Republicans, was doused in a glitter-filled liquid after being repeatedly interrupted by shouting protesters for questioning transgenderism.

Student Gerard Dabu was tackled by police and subdued with a stun gun after he used a water pistol to spray Knowles with what turned out to be lavender oil, The Hill reported.

Dabu has been charged with assault.