That's roughly the two sorts of response when a writer is getting feedback. I think Writer A's response is the most effective. Writer A gets to decide whether to act on the feedback because they've taken the trouble to listen to it and understand where it's coming from, even if they disagree with it. Writer B can't have listened to much beyond the first comment - and may have deterred the rest of the group from bothering to make comments.
Writer A tends to be a much better writer than Writer B because Writer A listens, and not just to feedback. Writer A doesn't need to be centre of attention, Writer A knows when to shut up and observe. Writer A is interested in other people and what they have to say, and that shows in their writing. I also suspect that Writer A is, underneath, more confident about their writing so they can accept criticism of it in a way that the defensive Writer B can not.
I've heard of several writing workshops where the writer is banned from even asking questions of clarification. That seems too extreme, but I think writers should generally keep quiet. Sometimes in class I have to stop Writer B mid-explanation because they need to understand that they can't be there to explain to every reader. If it's not on the page, it's not on the page and no amount of verbal explanations are going to make up for that.
If you suspect you're inclined to being a Writer B - and let's face it, we all have our moments of defensiveness - then try to control your impulses and just listen. One of my breakthrough moments came when my work was being workshopped by someone who I knew held very strong political opinions. They didn't like what they were reading, which was hardly surprising since it was contrary to their beliefs. I started to defend my characters then suddenly realised that it was a waste of time because they were never going to agree with what my characters were doing. But if I argued or defended my writing, I wasted time that I could use to get feedback from other members of the group, and that's what I wanted. So I stopped being defensive, thanked them for their feedback, then asked the rest of the group for their comments. Which were plentiful, and very useful to me in improving my writing.
If you're being workshopped, try to be like Writer A not Writer B. You'll get so much more from the session.