How come every conversation I have with someone turns into a fight?

My sister came to visit me for the holidays she forgot to flush and left a mess in the bathroom and the mgr said she was speeding so naturally I was pissed and screamed yelled in her face and slammed the door and said there has been like a hundred complaints against her the cops were coming and her car was being towed. She starts sobbing goes to talk to the mgr and the mgr said that she did not say that she just needs to slow down a little. Then I started screaming because I was running late for my hair appointment. They decided to leave and stay at his families for Thanksgiving can you believe that?
I am being unreasonable
Reasonable
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How come every conversation I have with someone turns into a fight?
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