Why does Vince look like such a fuckin weirdo 
it's from a complete lack of social skills.
how he perceives himself in the world and how the world perceives him are two totally different things.
complete detachment from reality. usually kids grow out of it, vince's seems to have gotten worse with age.
when people go through a childhood trauma (such as molestation, or drug use) their emotional development stops... so it seems Vince was most likely molested when he was 10 yrs old. probably by a family member, and uncle or father. so what you end up with is an 80 yr old man who's lived his entire life with the emotional maturity of a 10yr old boy. hence his lifetime of failed relationships.