Yes, some folks do need to check themselves, and it sounds like your
dealer is one of them (and probably won't be in business long). You
should do yourself a favor, though, and not judge the entire comic
sales industry on the actions of ONE retailer. I have had some
genuinely spectacular experiences in my life due to comics and shopping
for them. One of my best friends that I've known for over a decade got
to know me primarily because of comics.
As for you being an adult, why not demonstrate it by using proper use
of capital letters when they are warranted? (And by not letting one
bad experience form the basis for all future opinions about anything.)
No offense intended from me, either, and none taken.
Jeff