they're 'confusing' you for the parent poster of the comment chain you directly replied to in the discussion that you inserted yourself into, something understandable from anyone who spends time on sites that have parent/child discussion chains.
the confusion is solely yours alone, but for any other new users to the site you're taking up the role of continuing the discussion by commenting on reply chains inside that discussion, so having a reply to your comment that mistakenly mentions "your" previous post can be immediately understood in this context as the parents post and not as a misdirected attack that needs to be personally identified before continuing casual discussion.
do you need any more context to respond with honest intentions?