You have just shown that you will be a difficult student. ...(rest of snark mercifully snipped)...
Or he has shown himself to be an analytical, questioning student who does advance preparation and research before acting, and who values efficiency. If those qualities make him a "difficult student" in the eyes of an instructor, and they very well MAY for some instructors, then it's equally possible, and I'd postulate MORE likely, that it says more negative about the instructor than the student.
I've flown with four different CFIs, and liked, respected, and learned from them all. The moves from one to the other were driven mostly by convenience as I changed from renting to owning, then relocating the aircraft,rather than a search for a "better" instructor. Having said that, I ended up with an instructor who is as demanding as I am, and as self-motivated as I am. Over the years he's seen me go from a shaky pre-solo student to an increasingly competent pilot working towards an IR and doing an increasing amount of mechanical work w/ several local A&Ps (to the point where I'm able to help him figure things out at times), and I've seen him go from working for a very small flight school to freelancing to opening his own FBO/flight school/small rental fleet and becoming an upper echelon Cirrus certified instructor (can't remember the actual title). He's also become much more expensive over the years, and he's worth it. He's tough to schedule because he's so busy, and the hourly rate is tough for me to pay at this point, but I respect him and we've grown together over the past 12 years. He's military trained, an absolutely incredible pilot w/ over 20,000 hours, in constant demand.....and humble, kind, and never shows the kind of ego or disdain for student questions shown by a few other self-described top notch in-demand flight instructors here.
As one who's spent his life as a professional musician, I can unequivocally say that in the vast majority of cases, the truly best players are usually not the ones who are constantly telling you how great they are. The best ones are humble, enthusiastic about their craft, eager to talk about it and share their experience, and enjoy helping others who are sincerely interested in learning from them. The pompous blowhards, usually, are just covering for their own insecurities/deficiencies, or are just unhappy, miserable people for some reason.
I see no reason, nor evidence, that the CFI population is any different. No one is a perfect fit for everybody, student or teacher. People DO deserve to be paid for their time and expertise. Seems like all reasonable people should be able to find common ground and work within those two axioms.