It is bad to be upset when people are happy.
Mark who's foot is hurting a lot is at the office when Kim wins employee of the month and everyone starts celebrating loudly.
Mark wants to respond to the loud celebration.
Mark tells everyone that he thinks Kim is awesome and deserves the award.
Mark tells everyone around him to pipe down because he's in pain, and they're annoying him.
Kim is delighted that Mark is so complimentary and that he's happy for her recognition.
Kim is annoyed that Mark is making her moment about himself and can't stomach five minutes of celebration.