Why does this bother me?

A girl I’ve been seeing told me she only buys second hand clothes. Not for financial reasons, but environmental reasons. She believes clothing is too often thrown out when it is still good.

I can respect the principle here. She’s got a point. But it bothers me. It’s a good idea, but I’d like to put it off to some unknown “other people”. I think she should have the best, not other people’s discarded items.

Is this rational? Would it bother you?