He wasn't just holding up a sign, he for an extended period of time was holding up a megaphone harassing them.
Depending on how much they've actually faced similar things in their life.
Yea you're right, like the fact that we somehow have to debate about when to draw the line when it comes to old white men saying the n word on national television, whether or not Milo who actively harasses and doxxed LBGT students deserve a platform, whether or not to draw the line at a man saying that women in general deserved to be raped at multiple college campuses, with a megaphone no less, and then doing the same to teenagers, or whether or not it's ok to punch someone with genocide.
I wish I lived in a state where nothing said deserved to be met with violence. And that we must simply ignore or comply with everything that happens to us. Unfortunately we don't live in a country where total compliance and debate has no effect. Especially since we have people dying on the sword for the right to a platform but not for the right to not have to take shit from said platform.