Here's a new clearer statement to express my thoughts on the matter.
Contrails are visible and normal and fine. I probably don't fully understand the science behind them, but I realize what we are seeing is water vapor.
Chemtrails are also real though. They are invisible to the naked eye and are directly contributing to global warming as well as some health concerns that are hard to quantify. They are not some conspiracy to control or disable the masses. The exhaust of cars and especially planes leave a trail of harmful chemicals behind them. The reason for this is because we care more about convenience and money than we do about the ecosystem we live in.
I personally believe pointing out that dichotomy is more useful than laughing at people who are misinformed.