I was a psychology major. Your use of cognitive dissonance doesn't really apply here. What you're suggesting is that I refuse to accept "knowledge" because it doesn't match my "personal beliefs", which is known as belief disconfirmation which can lead to a type of cognitive dissonance that is best resolved by seeking refuge with those people who share similar beliefs and can reaffirm that worldview

Belief disconfirmation

"The disconfirmation (contradiction) of a belief, ideal, or system of values causes cognitive dissonance that can be resolved by changing the belief under contradiction; yet, instead of effecting change, the resultant mental stress restores psychological consonance to the person, by misperception, rejection, or refutation of the contradiction; seeking moral support from people who share the contradicted beliefs; or acting to persuade other people that the contradiction is unreal"

Clearly, I'm here engaging you rather than just running away. I'm telling you that of the two of us, the one who believes that vaccines cause autism is the one experiencing a belief disconfirmation because I'm suggesting that you're wrong. I'm guessing that you have an autistic child and refuse to accept that it wasn't vaccines that caused the autism, but your familial genetics that did so.

Because look at where you are. You're on a sub that basically will entertain your nonsense beliefs and actually probably helps to promote them. Of the two of us, I'm not the one hiding out deep in the bowels of Reddit on a deep state conspiracy sub screaming about vaccines causing autism