I try not to lash out at people. It really never has a positive outcome for either party.

My therapist had a definite boundary about that; he didn't accept abuse from clients, verbal or otherwise. He had no problem discussing differences, talking about what might be upsetting me, letting him know how I was feeling very frankly, but he did expect that I would not use him as a verbal punching bag. I actually appreciated that boundary as it forced me to actually think through and express what was going on instead of just ranting at him which really didn't get me anywhere. It also taught me how to set that same boundary with other people in my life; I don't accept verbal lashings from others in my life anymore either. It was one of the healthier boundary models that was able to take with me out of my own therapy and utilize in my life.