In the graphic the diner is depicted as being finished with their meal. The text of the tweet is perhaps bad PR because the author is assuming the public will use common sense.
The text of the tweet literally says "Don't forget to keep your mask on in between bites." How exactly are you saying that "between bites" should be interpreted?
I said the text of the tweet was bad PR. The graphic does not appear to have been designed to support that statement, however. Can you find any other public health guidance aside from this single tweet which supports the idea that you should don and doff a mask dozens of times during a meal?