Girl Scout Cookies

I was told, because WELS does not allow Girl Scouts/Boy Scouts (which I know and understand why), that we are forbidden to eat Girl Scout cookies? They said first off, you can't buy them, as you'd be supporting them indirectly; but they also added, we are not to eat the cookies. Can you expound on this for me? Thank you.

I really cannot expound on something that is incorrect. There is no synodwide practice that addresses eating cookies—regardless of their source. You will want to contact the people who shared that misinformation with you.