I personally don't believe in dry drunks. I have known too many non alcoholics who have the characteristics.
I think that some people are just mean and miserable to the extent that they have problem living with themselves too and hide in the bottle. Once they sober up, unless they work on themselves, they will still be miserable schmucks.
Now one thing I believe is that some people who white knuckle it can be very difficult to be around. We see sometimes posts on SR of people who have obviously not accepted that they cannot drink safely again and talking about being jealous of their partner or friends who can drink normally or who blame their drinking on others etc. Generally speaking though, those are newcomers and once they start accepting that it is what it is and also start relaxing their attitude improves a lot.