Arguments Are Not Bad. The Way You Argue Could Be.
Don't:
Tell someone to "calm down"
Raise your voice
Name call
Attack the other person's character
Belittle them for having an issue with you
Bring up sensitive topics
Storm out
Insist on being right
Leave the topic open with no resolution
Do:
Ask for clarification
Allow the other to express emotion
Consider your words
Stick to the facts
Focus on one issue
Take a break if you need one, but express that you plan to return to the topic in X amount of time
explore possible resolutions
Discuss what you learned as result of the dispute