|: I do not think this to be a question of language. Perhaps more of culture. And I think I don't use the term "Quads" not only because I do not like the word but also because there are inline skaters telling roller skaters to get "real" inlines.
I had some kids say to me 'nice rollerblades hahahaha' today when i went to the skatepark. (I responded with 'aye aye very good') I don't know whats worse, the fact they were comparing my skates to inlines or the fact they used the trademarked name. Their ignorance was overshadowed by their stupidity. So yea, i think it's a culture thing.