Trading is something more risky and for successful future in trading one should use his active mind for taking decision and if one don't understand about the price then how he will be successful in trading while being drunk. I think this activity is not good and we all should avoid this behavior. A successful man is one who concentrates on his goals while being drunk cannot be aware of his goals.
That's why in every alcohol advertisement there's always a reminder "drink responsibly" because once alcohol hits you, you might do things that you aren't aware. As the OP have already experience on trading and also knowledgeable, of course being drunk its possible for him to act carelessly but he's state of mind is in influence of alcohol. Luckily he gain than loss, because this is actually a serious situation where you risk your assets not being fully aware of it. In trading where we need discipline and emotional stability for you to have good calls, if he doesn't apply it to himself even not on trading then in the very next future he might losses a lot.