Just unsubscribe from all of Gritty's feeds: Instagram, Youtube, Facebook. I've gone as far as politely sending brands a note saying that I don't appreciate any brand that promotes him, and I've unfollowed others where he shows up, and I've told other people my reasoning as well. I've even tuned out and snoozed people I like for a while.
From Stone Glacier's perspective: I really want to try some of their gear sometime, but I honestly don't see myself doing so as long as someone like Gritty is promoting them. It's a big turn-off for me when you have a douche like Brian involved. I can't see how they view him as a good thing.
And my biggest reasoning isn't that he and Aron don't like each other anymore, I like lots of different gear, it's that he's turned into EVERYTHING he said he wouldn't when he first started Gritty Bowmen. Basically a shill.