UYH,
Three points.
First, I have never thought it is ok to take it out on the passenger, but I HAVE come to understand it. With your new labor relations rep, you are about to get a taste of the s$&t agents have had to put up with. Hey, back a chihuahua into a corner, and you'll get bit.
Second, give some equal time to management for this debacle. They have created a hostile work environment, so expect some acting out.
Third, open up you mind to how the other fellow lives. Every time your a/c pushes back, YOU have a full crew. Period. When that flight blocks up to the gate, agents may, and lately, will NOT, have a full crew. Just today, one of my sidekicks had one agent per a/c. NOT because of a sickout. Because of pisspoor scheduling. It was cool, though. The boss enjoyed Christmas at home, and one of his flunkie supervisors VTO'd.