It's not based on conspiracy or throwing out a quick unresearched opinion to just smite someone. It's based on search, and reading posts made on HN (over the years).
> (exaggerates for marketing purposes like getting funding) will just get downvoted....
> (not vapour), clearly points out it’s not ready for use, but has big ideas...
The difference is, being consistent with handing out such punishments (downvoting) and giving negative labels (vapor). Treat all the languages the same or equally apply those rules, otherwise the hypocrisy shows itself. Don't be so angry or surprised that someone may comment on it or point it out.
And when using terms like "vapor", let it be one's original thought, and not what is supplied by others painting a certain narrative.