As a matter of fact, I do avoid certain companies' products whenever possible for this reason, but lobbying against specific laws for specific reasons do not rabid anti-RKBA advocates make. I disagree with their stance, but they do not demonize firearms OR their owners, simply forbid carry in the park. As a practical matter, they lost the political fight but maitain their own policy on their own property. They have THAT right.
Frankly, for all we know, they hunt, too.