There are cliques and nutty people in almost any fancy/hobby. Don't judge all by the actions of the most vocal.
Most care about HOW you care for and breed the rats, and that feeders and killed humanely before being fed. Also that you are HONEST. Hiding that you raise feeders, hiding that rats sold to someone as pets, or as pet/show breeding stock, are from a feeder background, can do much worse harm IMHO.

On Facebook, a sane group with both pet/show and feeder breeders is: https://www.facebook.com/groups/RatGenePool/