I guarantee you both my SO and I are well adjusted adults. Just because you’re an adult doesn’t mean you can’t get angry or frustrated and all people deal with anger very differently. My SO grew up in a household where their parents yelled at eachother 24/7 and we promised to not be that couple. Instead of getting angry, being petty, or yelling, we just say: pinapple. That word signifies that we’re going to argue and we don’t want to do that so we take some minutes to think about it “is this worth fighting about?” Usually we use the word for little arguments that don’t need escalation. It’s actually an incredibly mature and “adult” thing to be able to remove yourself from a situation and give it some thought before acting. But hey, whatever floats your boat and works for you.