"Chevrolet" is just a smoke screen. It's a brand, an alias, a nickname. "GM" is the organization, the decision makers, and what is on all the employees' badges and paychecks. I understand the concept of "brand loyalty"' however you must understand that brands do not act on their own. They are simply product groups. The only people that exclusively work for a "brand" within GM are either in Marketing, or involved with the dealers in some way (sales, service, etc...).
Today many "corporate parts" are used in every vehicle. The only thing brand-exclusive is styling and marketing. Nothing more. So don't take offense that people are "disrespecting the brand." Cuz it's just a concept / marketing tool. In reality, its all the same people working in the background.