Letting your friends know what you think is probably not going to help. Their fight might seem ridiculous to you, but it probably doesn’t seem that way to them. Telling them they’re being stupid is only going to come off as judgmental, and just make them angry at you. The only time you should involve yourself is if things are getting completely out of hand. In that case, tell both of them how much you hate watching them fight. Remind them that they care about each other, and ask if this fight is really worth ruining a friendship over.
Once you say that, don’t make yourself the mediator. They have to make their own decision here, and you going back and forth between them is only going to stress you out. If they want to keep arguing, make it clear that you’re not going to a part of it in any way. And if they want to make up, they will eventually, with or without your help.
And if one of them gets mad at you for not being on her side? Tell her it has nothing to do with her and that you just don’t want to get involved. If she can’t understand that, there’s not much you can do to make her get it. You should never feel like you have to fight just because your best friends are.
What’s on your mind? Heather can help! Send her your question at firstname.lastname@example.org