Please don't apologize for being honest.
There are differences. Many contrails disappear after a few minutes but the videos that Handson posted CLAIM that the only difference is that chemtrails linger around for hours and make the sky hazy. The problem is that no one, anywhere that I have read or watched has given the evidence as to why those aren't just contrails too. The second video claims these long lasting ones didn't start until November 1998. As already demonstrated here in this thread, that is simply not true. Anecdotal and photographic evidence says they have been around since airplanes took to the skies.
I can prove in a laboratory setting that atmospheric conditions, temperature, pressure and humidity play a role in determining whether condensation will remain in the air or dissipate rapidly. These people are basically saying that clouds cannot exist, since they are merely long lasting areas of condensation.