What an over-generalized and incredibly strange comment.

I think it's great if something I said made you self-aware, if you think you may have been in error and are asking for clarification, but what is making you pipe up? It seems like you want to be included.

I'll reciprocate. - If I'm understanding what I am reading, at the stage of life OP seemed to be when he had his experience these would have been relevant social categories. They are highly generalized like you say, but none of us were born with perfect reckoning. This comment is not strange, because I am showing that there are others who suffered the same and we don't have to be silent about it.