Bullies (who often tend to be liberals) are not very happy people deep down inside.
I can attest to that. I’ve had the misfortune of working for one. She never smiled or laughed an anyone’s jokes. Seldom gave out praise and was more likely to criticize. She was anti-oil. One of our buildings was heated with one of those zero emission propane furnaces. Because this was dirty filthy rotten ecology ruining oil byproduct she paid to have the furnace replaced with electric heat. Little did she know that power came from a huge coal fired power plant a hundred miles away.
Leftism is a disease, being unhappy all the time is merely a symptom.
You see it in the way they treat other people who they believe are "beneath them", such as restaurant staff, limo drivers, underlings, etc.