5 Ways to Do So:
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1. Just basically take a deep breath and THINK before you ever say anything.
2. Stay calm, don't overact. If you stay calm it'll be easier to let go of the whole situation.
3. Be confederative. Look at the other person's point of view in the situation.
4. Maybe consider what the person is going through. The person could possibly going through a difficult time and is just a bit depressed.
5. Don't respond to rude things with rude comments of your own.