Because she's an alternative-lifestyle girl, or whatever you want to call her. If she were a he, like a white dude in a suit, they'd be backing away quickly and worry that he'd snap. But she looks to have some social victim status so those same people will override their better judgment to appear openminded.
I think this might be the real reason. Well done,
@Kittyskyfish.
The reason I think so is because I had a somewhat related experience just last week. It was a hot afternoon, and I had a few hours to kill before my next appointment, so I went to a local McDonalds (A/C, free wi-fi, cheap brewed iced tea). A man came in and sat very near me. He seemed a bit off, but whatever, live and let live. As time passed, his behavior became more and more odd, including vocalizations and grunts which became quite loud, going in and out of the bathroom constantly, jogging around the restaurant, talking to himself loudly, and eventually taking off his shirt and jogging to the soda fountain area, where he proceeded to wash himself, including his armpits, from the soda fountain. This took place over about an hour. The soda fountain bit was the last straw, and I finally got up and spoke to the manager, who indicated they had already called the police more than 30 minutes ago. The manager also said he was amazed that I never changed seats or moved away from the crazy man, and that I must be very brave.
In fact, while I do have a higher than average tolerance for unusual behavior, the other reason I did not move tables is because the man was black, and I did not want to be one of those white people who was unreasonably intolerant. It was also why I waited so long to speak to the manager and eventually call the police myself. I didn't want to be one of those white people who call the police on black people who are doing some normal thing, like going to a McDonalds. In retrospect, I cut this guy way more slack than I would have if he had been white, or Asian, or Latino.
So I think kittyskyfish hit the nail on the head with her explanation.