my dad was in the navy, and sometimes celebs would visit an air craft carrier while the service members were on deployment
and one time an actress (sadly I forget who) and vin diesel were the ones who visited my dad's ship
and dad said Vin was a gigantic dick
blew off guys trying to talk to him, tell him what a fan they were, etc. acted the whole time like being there was just such a chore, didn't even try to hide it
and apparently only showed signs of life when he got to zone in on the servicewomen.
i didnt have too much of an opinion on him until the last riddick movie which i think he wrote and you get a pretty good glimpse of him through the glass