And taking it a step further why is it not immoral for vegans to support outlets that stock mass produce meat or meat per se depending on your definition?

Could also read:
Is it not be immoral for vegans to support stores that sell meat?

Infringing on the rights of another being in a way in which you would not like done to you or those you love. It's very simple, it's the golden rule..

Infringing on the rights of another being in a way in which you would not like done to you or those you love. It's very simple, it's the golden rule.. The like main spiritual teaching of all religions going back thousands of years. Don't do to others what you wouldn't want done to you. It's simple. Anything you wouldn't want done to you, don't do it to others.

I don't see how you are trying to apply this statement - as many religions condone meat eating.