i'd say it depends on the reader.... if its a critique partner, i expect discussion (if any of you on here that I know asked me to give feedback or do a critique exchange, I would be more than happy to engage in discussion because I know we both are trying to improve our work).A note to critique recipients - you shouldn't respond by explaining something about your characters or plot, unless that is something that appears in part of the story you didn't include.
You won't have that chance to explain to a normal reader when your story is in front of them. If it's important to understand, it needs to be in the text in some way.
If the person is a beta reader from Fiverr or a general reader giving feedback (or if any of you say up fron that you dont do discussion), I dont expect discussion or to ask questions. I take the feedback and figure it out myself.... or I come on here and ask for advice lol
Which leads back to my first post on here... the critiquer should be upfront about what they offer
(the example I gave was an instance where the critiquer was not upfront about it and took my questions, explanations, and possible solutions to what they pointed out as me arguing and not being able to accept criticism)