If someone did that to me for the purpose of trolling I’d just block them and move on with my day. If they wanted to discuss or ask why my views had changed I’d happily have a conversation about that
Sometimes I bounce old threads if there is something I want to say/news about an old topic. The benefit is that you can see people’s thoughts from a point in time, how they might’ve changed, plus learn things about the subject you didn’t otherwise know.
Seems pretty straightforward to me. Like...