I read through it all and I have to say that you don't need to feel that way. I have this store I go to when I am SOS on parts and the owner, put in nice words is a bitch (the nicest I could find). He tries to keep putting me down for flying FB planes, at first I have to admit it bothered me and hurt some, but then it hit me. Why? Why do I need to feel that way? Am I enjoying what I am doing, and I much rather crash a FB plane than a balasa plane. So now I just ingore what others think, and go have a good time .
Honestly the hobby store owner needs to work on his sales tactics. He shouldn't be tearing you down for what you are doing, but actually trying to sell you on the stuff he has and how it's better (even if you have no interest in it).
We have another guy at the field who does FT planes but I think it was of a phase for him. He flies them on occasion but now he seems more interested in DIY drones.