Why do we get madd so fast for?

Like today it was me and my sisters and my borther in law we got in the car and she strat to yell and I did said nothing back and she strat to yell at my brother in law for dumb thing and I told her that I for got to put the dog back in the house so she drop me off and we strat to yell back in frond and I was saiding bad word to my sister because she got me madd