I've read and re-read your comments. In my opinion your comments were harmless enough. I'd tell the store owner to go urinate up a rope.
This is still America and if he took offense in your simple comments he takes himself much too seriously. Too many gun store personel think they know everything about everything just because they stayed at the "holiday inn express" the night before, if you know what I mean. Just because they own or work there don't make them infalible or experts.
I'd find another dealer to do business with unless his prices were low enough to make up for his misery. Then I would keep it strictly business with him. You're a potential customer and that should at the very least get you treated with respect and a smile. Give your business to someone else.
+1 (what you said ) and 100% spot on.
I had an FFL for around 13 years. I obtained it in part of the way most of the local dealers thought they were doing you a favor by letting you in the shop and then charging retail or more. There is nothing worse than someone with an attitude and I will be damned if I give those types one cent.