First of all, I think you're imagining things, or being paranoid, or over thinking, or maybe some of all three.

However if you want threads to stay alive after you post, just say dumb and/or controversial things, or express an opinion on something for which there's no answer. After all, look how long threads on topics like chain lube or cleaning, an wheel building seem to get. Or visit the P&O forum where people can "debate" nonsense seemingly forever.

Otherwise just say what you think, and let the chips fall where they lie.