Well, from what it seems, they don't think all contrails are chemtrails, just the ones that last more than 5 minutes.
I can imagine seeing these people sitting in lawn chairs, with tin foil hats on, and a timer, timing each contrail, then when it exccedes 5 minutes they start running and yelling about the government spraying them with chemicals. I kinda feel bad for them.
I thought I was the only one who had to deal with these people.