You argued my point for me. In the same vein as someone not liking your particular set of mods, not everyone is going to like your opinion (your mods are essentially a personification of your opinion/tastes, so the logic extends outward, naturally). In other words, "I don't like your caliper covers" is just as relevant as "I don't like the reason you don't like my caliper covers" which is subsequently just as relevant as "I don't like that you don't like the reason for someone not liking something." I'd argue the latter opinion (yours) is the most wasteful, as it's the most obvious and thus the most unnecessary addition to the dialog (and you'll forgive me for saying, but it's also the most adversarial, as it subtly implies it's okay for one person to share their opinion, but not for the other -- as you highlighted with your somewhat hypocritical "deal with it" comment).
Either way, it's a forum, and all discussions relevant to the board or topic are totally welcome, I assume. Personally, it's not the "I don't like the caliper covers" I really took an issue with, it was the connotation of negativity applied to it by using language that is derogatory toward the user, either implicitly ("minus the poser covers") or explicitly (outright belittling someone for making a personal choice that hasn't affected the individual in any way). It just follows a very juvenile mentality, something I don't tend to associate with "enthusiasts."
As you said, to each their own. For the most part, Chewy wasn't being offensive, but I have seen the discussion go in a different direction before, and it just seems silly to berate someone or make them feel they're inferior because of some arbitrary standard you've created.
And I'll ignore your Supercharger analogy, as it was totally hyperbolic. Anyone that thinks a supercharger on their D is stupid should be summarily ejected from the earth and forced to float endlessly in the void of space, which is almost as black as their heart.