Sometimes. I find it hardest to admit I'm wrong when there's something at stake besides what's being argued, if that makes any sense. Also when I either dislike the person I'm arguing with or am angry with that person for some other reason.
But one good thing about the way lawyers are trained to think is that I'm in the habit of thinking before I speak. Not that that makes me always right, but I've usually considered the arguments on the other side before I commit myself.