I've watched something about an autistic person with a photographic memory who said they had trouble with the concept of "a church" because in their mind they could only picture specific churches and they all looked different. I've seen anecdotes of people with perfect pitch saying that if a tune was transposed to a different octave or played in a different key or interpretation, everyone else says it is "the same tune" but to them it has different notes so it's a different tune.

I don't know if it's weird; generalising a category from specific examples is saves memory space over remembering every individual teacup we've ever seen, so going the other way starting with a general concept of a teacup and only specifying as and when needed seems to make sense.