I will let people more familiar with constitution law argue the nuances of whether they have a "right" to this particular ban.
Anyone can read the document & commentary by
our betters. I feel qualified to venture opinions in
some areas without claiming expertise. No one
expects scholarship from me.
At minimum, I consider it a foolish and unnecessary way to invite criticism and backlash.
I regularly invite (in the sense of expectation rather
than intent) criticism & backlash when expressing
my opinions. Life would be limited indeed if we
kept quiet from fear of criticism.
Do you oppose allowing student groups to ban
some speakers from their venue? This smacks
of compelled speech. Are you OK with this?