I also don't believe that he's a racist. As I said when Gibson stepped in it, some folks are what we used to call a "mean drunk." When in that state, they will deliberately try to be as nasty as they can. They will vent their spleen at anyone in range, without the inhibitions they have when sober.
A time or two, but thank God not often, I've gotten blitzed enough in the wrong state of mind to see the world through those lenses, and I'm grateful I had good friends to drag me home and put me to bed before I could risk harm to myself or others.
Now, that in itself is certainly a character flaw. Something they could overcome, with help. It's not a crime, and it's while it's a decent venial sin, it's not a mortal one.
Some folks still do.