Reply To: What would you have done in this situation.

I would dan l’kaf zchus and assume that there is something under the surface that is not visible to the naked eye. Most probably you should say B”H that this bochur comes to shul to daven with the tzibur. It is not likely that a child or a bachur without some sort of issue would come that late, or would make a scene and bring notice to himself that he did come late rather than just sneak in quietly and catch up. The fact that he immediately made himself the center of attention and either did not notice or did not care is not b’derech hatevah. Please don’t rush to judge that it is an act of chutzpah. It might just not be.