Well, I mean, an established distinction between the terms (when they're utilized separately within the same language) is that enquire is used for softer applications, essentially meaning 'to ask about or look into', while inquire is used to indicate that someone is seeking into a matter in a formal or more technical capacity (ie, with an association similar to inquisition). So your utilization wasn't by any means incorrect, even from a US perspective, I just found the emphasis on 'US-based minds' immediately following the usage to be amusing (given that inquire seems to typically be favored in the US regardless of context). And, y'know, it's fun to tease. :P

Though, I've not seen a distinction based on form, as you noted above, before. So I'm not really sure if that's just your quirk or not. :P

And meh. Pedantry, stressing over inconsequential details, is non-constructive and potentially troublesome in any context, not just a grammatical one. On the other hand, striving for better understanding of the world around us and a better ability to clearly communicate with others seems like something that'd only be criticized by those who make a habit of deliberately avoiding respectful and clear communication with others.

In short, it's not the fact that you tried to clarify your perspectives that makes you sound British, it's the fact that you said what you said while holding a teacup with your pinky raised and stressing a nasal tone that did it. :P

And please, I grew up in Texas. You'll have to use a whole lot more "ain'ts" and "y'alls" before you try and claim that- besides, you're so clearly British. I mean, look at that top hat! Everyone knows Americans only wear beanies.