I think the group was pretty decent, but they apparently showed up without reservations (for a party of 25) in this place, which is not that big a place. The hostess was attempting to clear out seats, but naturally you can’t tell the other patrons to get up and leave when an unexpected party arrives.
I would assume that the supposed white patron was probably sitting in the section the hostess was trying to clear, although I think it’s odd that she said she felt threatened since this doesn’t look like a threatening group. Maybe she said she felt pressured (to leave); maybe the hostess said that and didn’t communicate it well. I don’t know.
I am surprised that any venue below the status of “21” would turn away 25 people - especially on the complaint of one person. I will never forget having a New Year’s Eve dinner in a deluxe restaurant ruined by screaming, rowdy, verging on violent children. I asked the manager to say something to the parents, to rein in their little terrors, but he refused, even though it was disrupting the entire restaurant.