If that was the case, which it may very well have been for all I fucking know, and he was unable to be alone without his mother, I feel that his mother should have breastfed in the waiting room where he was welcome. There's no rule against breastfeeding in the waiting room, as a matter of fact I've often seen people do it when the room is full.

The sign said "Mothers Only" not "Mothers and Children Only". She felt entitled to disregard the sign as if it didn't apply to her and her son.

I suppose my commentary about his disability is moot, because even if he was visibly disabled, I ultimately still wouldn't have been ok with him being in there, because the space is designated for mothers only and he's a man.