The chemtrails conspiracy nuts aren't confused about cloud seeding. They believe contrails are visible evidence that airplanes are used to disperse mind control drugs over the populations below.
There are many people that believe the contrails, that they refer to as chemtrails, are about weather control. Those are the people that I think are confused. Just search "chemtrails weather control" or "manipulation". I have also spoken to many people that hold this belief.
Also, read the wikipedia on chemtrails: https://en.wikipedia.org/wiki/Chemtrail_conspiracy_theory