point out to the store managers that they should provide proper bike parking (no ****ing wheel-benders!), as you prefer to shop where you can conveniently, safely and securely lock your bike, without causing a nuisance or a hazard to others.

do they say they want your business, or do they really want your business?

if the only place you can find to lock up creates conflict with people pushing strollers, people in wheelchairs, emergency services, blocks a sidewalk, blocks shopping-carts, etc... point that out, and politely explain that you'd much prefer proper bike parking facilities.

if your city or state has a published "bicycle parking guidelines", refer them to it. if not, find some other jurisdiction's bicycle parking guidelines and refer to that. most of these guidelines are pretty good; they exclude wheel-benders and help with proper installation of proper racks.