Everyone lies to themselves, but many people do it with good intentions. They want to believe what they tell themselves, it is oftentimes the best possible version of reality for them. Although it may not be accurate, it is a mural of their desires, aspirations, optimism and passion. These people usually either need time or a new experience to discover the truth. People who lie to themselves for different reasons are oftentimes trying to avoid something or escape blame for things they have done.
It's okay to disagree with the thoughts or opinions expressed by other people. That doesn't give you the right to deny any sense they might make. Nor does it give you a right to accuse someone of poorly expressing their beliefs just because you don't like what they are saying. Learn to recognize good writing when you read it, even if it means overcoming your pride and opening your mind beyond what is comfortable.