It looks like there's no helping this type of person, as they see nothing wrong with them. Our best defense is to learn how to cope and manage them.
He is sometimes shown to have a good sense of humor.
"And I think that no matter what, Mum always says that they’ll always be married.
And to her, Mom and Dad, they're always going to be together.
Ross seems to have a childlike need to always be right.
Such as in The One Where Heckles Dies, when he finds out that Phoebe doesn't believe in evolution.