I need to let crap like that go, because he says it to intentionally hurt me.
Write this down and hang it up if need be but remember it. Make it a mantra. You are letting another human control your emotions. You control your emotions.
Coping skills?
Punch a pillow.
If you need to cry, cry. Let it out to let it go.
Deep breathing... .buy some bubbles, sit and take deep breaths and slowly blow out bubbles. (This is a great trick to teach children how to calm down.)
Become mindful (DBT skill) Sit notice everything around you, feel your body touching the seat below you, wiggle your toes and feel how your shoes feel inside, notice texture of whatever your hand touches, close your eyes feel the air around you, etc... .you get the picture.
Opposite action (DBT skill) If you feel like firing off an email do something different that keeps you from doing something that will come back to harm you.
Talk a brisk walk around the block, this releases endorphins and naturally helps.
There are tons of other ways to cope. Can you think of a few?
(DBT skills are excellent for anyone)