Its the cat equivalent of a mongrel dog, otherwise known as unknown parentage. I dont see the problem personally, owning both moggies and pedigrees, its not something I take to heart, after all thats what they are
What else could we say? Can you suggest another name?
There is a need to differentiate between the two, as pedigree cats are very very different to moggies, from immune systems to activity. Especially if you keep both types of cat, there is a huge difference, enough to warrant seperate names!
I think you are taking it a little personally though, making comparisons to social pc or non pc racial terms is a little...odd!
ETA; Not everyone spends hundreds of pounds on a pedigree just for a 'special name'......