Two observations -
1/ Aviation reporting, how accurate do you think this report actually is? Given we all know aviation reporting is, well, a bit dungy.
2/ Given the choice, how many here would pax an individual stupid, psychotic, under the influence or whatever enough to make those comments?
I for one am all for the captain/ crew exercising their right to exclude any pax they feel might be unsafe.
Embarkation is not a right, it is at the discretion of the crew.