Honestly? The serenity prayer.
Give me the strength to accept what I cannot change, the courage to change what I can, and the wisdom to know the difference.
Yes it's pithy, and I'm pretty sure there's nobody, other than me, granting me strength. I use it more like an affirmation and a test. Can I control this? No? Then I let it go. If it's something I can change, I ask myself what's the most humane way of doing so? For example yelling at people and insulting them isn't very humane and isn't likely to result in change.
Another thing I actively try to remember is that people are not puppets. They have their own mind and their own agency. If they refuse to change then the problem gets let go. Life is too short to let other people's behavior bother you unless it's putting you at risk of being physically hurt. If none of this helps then removing yourself from the situation or breathing exercises might help.
I'm not some happy clam either, I struggle with this stuff everyday. Anyone who looks at my posting history can see me struggle with it. But this is the approach I've had the most success with.
On the off chance that you actually have a problem with audio processing, (loud or unexpected noises/talking triggering anger etc), you might try noise cancelling headphones.