One piece of advice that I wished I had applied earlier in my life: Do not respond to insults.
The hard part for me is, after the insult has passed, returning to a kindly and friendly demeanor. And, I guess, this is really the higher training in not responding to insults — it is restraining the internal response as well. It is the silencing of the voices that want to blame, judge, criticize and jostle for moral superiority. But, in the end, it all comes down to this:
Do not respond to insults.
Cattāri Brahmavihārā 
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