Per the news articles, it requires masks indoors, vaccinated or not, unless the person is actively eating or drinking.
I infer there is not an exception for dancing, singing or having pictures taken with friends (the mayor is second to left in, the first image and in the middle in the second image - both images from the SF Chronicle story).
Both the Fox News report and the SF Chronicle report give a video clip of the mayor singing and dancing without a mask (the reporter taking the pictures also seemed to not have a mask)..
Apparently, the Mayor's defense of her action is,
"While I'm eating and drinking I'm going to keep my mask off," Breed, a Democrat, told reporters while calling the story a "distraction," according to FOX 2 of the Bay Area. "And yes, in the time while we're drinking like everyone else there, we were all having a good time and again all vaccinated."
The mayor insisted the focus of media attention should be on live music returning to San Francisco and said that putting a mask on in between eating and drinking isn’t "realistic."
This seems to be an admission that she knew what the rules were (in fact she was responsible for the rules) and broke them knowingly.
That's hypocrisy.
Fox News report here.
SF Chronicle report here.