We don't know, however, if this is SOP for Mom. Does she walk into Hugh's room to wake him up for work when he *doesn't* have company? If so, I'd call her behavior in this situation clueless and boundary-challenged (even if I were accustomed to going into someone's room to wake him, I'd refrain if he had company -- what if they were having a Moment?), but not any kind of PA slam at the OP for daring to share a bed with her son. (Which, if she had a problem with, she should have addressed by assigning the OP another room.)
She was still inexcusably rude to the OP with the public criticism of her table setting technique and the put-down of her course of study. I just don't think the wake-up call incident falls in the same category, nor do I think it's necessarily PA.