Yes/no in terms of the on purpose. There are a few different definitions out there for psychotherapy intervention - the most generic one I found is: Any action or inaction, including verbal and nonverbal behavior, taken by a psychotherapist with the purpose of advancing treatment.

So your T may have purposely brought up something to talk about in an attempt to bring something to awareness or get you to think about how something is impacting you, or whatever. I think I waffle on if a good therapist would do something as calculating as to incite an altercation or rupture. I'm sure they bring up topics that are sensitive and they may miss the mark on timing, word choice, or general technique in delivery. I guess I want to believe that when something goes astray with good therapists it is due to one of several different things none of them being because the T wanted to offend, upset, or purposely cause a rupture/pain. They are human; they make mistakes and have bad days; they have their own issues that may filter in regardless of their training/experience; and we have issues so likely they'll touch something that is "triggering" for us. I believe most of them are taught that it is those things that result in the ruptures and that they don't have to fabricate them. Then again, I'm not a therapist, nor have I been in any therapy training program so, it's possible that being confrontational, or somehow rocking the boat, is one of those interventions given either client temperament/needs or therapy stagnation, or ...?

As you can see from here -
The Ten Coolest Therapy Interventions: Introduction | Psychology Today

one intervention is: Head-On Collision.

This is explained as:the therapist becomes a much more active agent of change and where resistance is handled directly and firmly.

Cool Intervention #5: Head-On Collision | Psychology Today