"Real coffee drinkers" are no more a definable group than "homemade humous eaters" (hence my mockery).
I love a good coffee and particularly rate Monmouth in Borough Market, Nude espresso (off Brick Lane), Workshop (Clerkenwell) and Caravan (Exmouth Market). I'd be embarrassed though if I let a love of good coffee develop into some of the extreme (but comical) fussiness I've read on here!
There can be a world of difference between a good wine and a cheap plonk but I'm damned if I'm going to start doing a quality check with my host before I accept their kind offer of a glass or three, it would make me look like a pompous prig. The idea that they should feel remotely apologetic about what they are giving me is appalling.
No different with coffee, and to suggest you find the two tastes so different as to find instant utterly in drinkable - to my mind that makes you sound like a fussy toddler rather than an adult. It's an affectation, like saying you can only sleep on Egyptian cotton whilst giving a little apologetic shrug in a "what can I do, it's a trial for me but my body just demands the finer things in life".
Become a gourmet, an expert, whatever, that's great. But in all areas the minute you put on airs about no longer being able to stomach something unless it is of a higher quality you run a very considerable risk of coming across as a pretentious twat!