Hostile? I would call it "fair". Because, ok, let's assume you win. I'm wrong, you're right, and some ultimate dictator decides that all websites now are coming

Hostile? I would call it "fair". Because, ok, let's assume you win. I'm wrong, you're right, and some ultimate dictator decides that all websites now are coming in black-on-white only. What should I do, as a person that feels low-contrast is much nicer than eye-burning one? Exactly, I'm about to make my own customizations or suffer. And then you should be saying, that black-on-white is hostile to me, which wouldn't make much sense, as you (or somebody else for that matter) would have something to complain on either way. Hence my first point about "if it hurts conversion/…". In other words, if it's your business — it's your business. If it's not — well, you are free to complain about other people coloring their stuff as they like all you want, but I hope they won't be upset about that, because they really shouldn't be, and believing that your point of view is the only right one (even if it's supported by some Nielsen or whatever) is simply ignorance.