They think it is a disorder to NOT want pesticides and dead food, WOW

Despite the fact that orthorexia might apply to some people, don't even bother trying to understand why mainstream health thinkers extend it to broadly cover all healthy eaters. This stretch is either uneducated or irrational, that's it, end of story. No need to waste any energy getting worked up about the opinion, or processing it at all beyond, perhaps, composedly acknowledging its existence. Just keep doing what you're doing, there will always be naysayers, most of them aren't worth giving a second thought.