I agree. This is a very simplified explanation on my part, but a lot of it comes down to how people will categorise others or conditions into "boxes". While this has its value in terms being able to organise and structure the world around us, the problem is that it also means people generalise. This leads to situations like yours, as we're too complex to simply group together into boxes and people need to be treated individually to be understood on a deeper level.

I'm glad you both came to an understanding, and frankly speaking it has a positive, as someone was educated as a result.