We all get angry sometimes and most have to vent our anger at people they either think have caused it or to others who will listen.

After listening to that persons problems and on what may have caused their problem too, many may offer advice on how to move on.
And here is the problem, TIME TO MOVE ON.

Some people just cannot do that and try to drag others down to their level of how to treat people.

I am sorry if you or others have been treated badly before, but deep down did you treat the people you was with badly too,

Just a thought.