When individuals aren’t nice to us, the natural reaction is return their unpleasantness back to them as quickly and assertively as possible.
Unfortunately, this is completely wrong. All this approach does is create a spiral of negativity.
Instead, send goodwill sincerely, authentically, and specifically. Even if the other person doesn’t change, you will feel better (as long as you avoid feeling self-righteous and arrogant).
Have a good day,