These are people who know nothing about breed conformation just trying to state their opinion of extreme dislike for the American/Canadian showlines, they see the angulation created by the stack and used in the show rings and that is all they see or care about, so they often comment that they "don't want a crippled dog and want a dog with a straight back"... it's just a lack of knowledge... you can't blame them considering the ridiculous misinformation being spread by people about the German Shepherd dog.
Don't stress... direct them to correct information and carry on. Not worth getting so upset over.
SG S-Hunter vom Geistwasser CA CGN TT (Airport Wildlife Control K9)
Zenna vom Geistwasser
"May my enemies live long so they can see me progress."