Feet on the armrests, regardless of medical condition, is not excusable. If she had such a problem that that it was necessary for her to put her feet into your space, then she should have deplaned for medical treatment.

The FAs (and UA) seemed to handle it as best they could under the circumstances. They offered to allow the woman to deplane for medical reasons, which she refused, and they offered what assistance they could to her in flight. They also asked her to put away the ointment, although it would have been nice if they could have intercepted her sooner.

As for different cultures' beliefs and values, one is generally supposed to try to follow those of the country in which they are traveling (i.e. no shorts or bikini tops in Muslim countries, etc.) Certainly we all make mistakes when abroad, and we know people will do the same when here... but surely the woman wasn't completely clueless that she was causing issues for everyone else. Some people are just selfish, of course. I'd have been ticked off had I been on the flight, but what can you do? Not much.