In my book, being emotional or filmed in a public space are still not good enough reasons for toxic masculinity/aggressive behavior - especially against a crew worker as a talent. You don't need physical contact to have someone feel threatened in the workplace.
there's also an issue of poor management at play with the ERU. The staff member should have been give clear instructions after the first incident rather than be let continual harass an individual.
i don't think it was a big ask to have this person not film straight after the performance back stage.
we don't have full details here but I'm sure after the first two times this staff member was aware of the issue and yet continued anyway. that seems like serious disrespect of someone's boundaries in my book.