Dinner Reservation Gone Wrong: AITA for Walking out on Friends?

A group of friends made a reservation for six people at a popular restaurant, but when they arrived, one friend brought her boyfriend without notice, making the total number seven. The restaurant couldn't accommodate them, so the leader of the group turned to the author and asked them to leave so they could have six people. The author was shocked and called the leader a b***h. The next day, another friend texted the author, calling them the a**hole. Confused, the author turns to Reddit for judgment. Was the author justified in calling out the leader's behavior or were they in the wrong? Read on to find out what people had to say.