Test new people early on, that come into your life. Try a simple disagreement over a minor issue. If they cannot cope with another opinion on a small matter, you must get away from them ASAP. Huge red flag 
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This one seems to be becoming a crucial issue in today’s world sadly
If somebody can't take another POV on a minor, non-issue, then its usually a sign of a very deep-rooted problem, that will rear its ugly head at a later date. Best avoided.
