Pressure testing does exist, and some interviewers naturally come across more intense than others. That said, there is still a line between challenging a candidate and creating an unnecessarily disrespectful experience.

In the interview itself, your job is to stay composed and answer the substance of the challenge. Even if the style feels harsh, the best response is usually calm clarification, not emotional reaction.

After the interview, though, you are allowed to judge the experience honestly. One difficult interviewer does not always represent the whole firm, but if something felt clearly inappropriate, it is reasonable to note that for yourself or raise it carefully if needed.

For prep purposes, I would train for the possibility of harder pushback so that the style itself does not throw you off next time. You may also find it helpful to read staying calm under pressure during a case interview if you want a more structured way to practice this.

Some interviewers definitely confuse pressure testing with just being abrasive.

Was the interviewer pushing back on your logic, or were they interrupting even when you were answering directly?

I think the question is whether they were testing your logic or just cutting you off constantly. Those feel different.

Even if it was genuine pressure testing, firms could still do it in a more professional way.

Best prep is probably to get used to some pushback in mocks so the tone itself does not shake you.