noitallmr:
Who says the person was a student of the yeshiva? Perhaps he just came in to learn? Are you telling me he is not welcome because he is wearing a blue shirt?
Also does that Yeshiva have a dress code of white shirts only? Even at the time of the picture (which was just copied from a previous year)?
I agree though with the point of following the yeshiva’s rules if you are a member of the yeshiva.