Why do people ask what breed their kitten is then get so pissed when you tell them it isn't any breed?

I think it is the way the question is answered that make a difference. I have seen a few of those types of questions, and although some people get pissed over nothing, others get full out ripped to shreds. So a person made a mistake and bought a cat they thought was a specific breed. Mistakes happen, and hopefully they have learned and won't make the same mistake again. Yet I see people responding to them saying things like "You are a horrible person for buying that kitten" or "Shame on you", etc. I think it is this that makes those people defensive. I know this isn't the case for every situation, however it does happen quite frequently. Maybe some people should try to be a little bit nicer in their answers and offer advice instead of bashing the person? These are just my thoughts based on my observations!