What are good techniques to not let thungs bug you?

My brother mom and u were playing a game because we are in vacation, while doing so, my brother was tapping the table, shaking the table, chomping his gum, anything to be an onery mother effer. After my mom and I asking him at least 15 times previously. He stopped for all of two seconds. He started chomping his gum again and, by now this has been going in for over an hour, and the whole time, my tolerance was being depleted by him being onery. My mom asked him one last time, more of a command than asking, "stop chomping your gum, isn't it obvious you are annoying us?!" He stopped for a second and chomped again and said as innocently as he could, "so for the record, this iswhat you don't want me to do?" Like he didnt already know. So I threw down my cards and said, "f*** you! I am done listening to you being an onery little s*** head. You're twenty-f******-on! Its time to mature the f*** up and stop acting like a God damn (I am a full on Christian, so saying that was a huge deal) f****** twelve year old! (My cousin who is 13) is more mature than you! I don't know what God was mad about when he made me deal with your stupid a**! Grow up, b****!" And then I walked away. I got back about 15 minutes later, walked right into the living room, and he said, what the he'll was that about?" To which I replied, "that was me getting out my frustration towards you so that when we got home and you annoyed me just a little, I didn't grab dads gun and put a bullet through your head!" I know I didn't handle that properly so I am wondering what some of you would have done in that situatuation. Thank you.