I prefer "LOL."According to the ODT Code, until there’s a meeting time and place agreed to in pms, there’s no binding deal, so an offer without meeting details can’t ever result in the offerer getting hooked in.
So no need to worry about your stale offers, unless you included a meeting time and place in the offer.
Imo Folks ought to reply “no thanks” when they see an offer they don’t like.