This is very true and I often find myself asking for clarification on comments I don't understand why they get downvoted. Usually I manage to give enough context as to why I'm so ignorant that I need to ask the question, and most times I don't get downvoted down along with the parent comment.

But the person you replied to said they downvote people who complain, not ask why their comment is downvoted.

There is a fine line between complaining and asking for an explanation though so I see your point and your reasoning but I felt like I had to make this distinction too.