Contrails only occur under conditions so rare that the vast majority of people will never see one in their lifetime. Furtheremore, these rare conditions only occur at altitudes too high to be seen from the ground.
Now that the government is spending hundreds-of-millions of dollars on disinformation and are attempting to convince the public that contrails are "normal" and "harmless", people are coming out of the woodwork on social networks claiming that they have seen contrails all of their lives.
So much money is being spent on disinformation, that it’s not likely that you will occasionally run into them on the internet. It’s much more likely that you will be inundated by them and that online groups will be saturated with them.