It's probably obsessive-compulsive disorder (OCD). Pat has a compulsion to have the last word, instead of to check to make sure that his door is locked, or to wash his hands, or whatever. His alcohol intake is definitely worsening symptoms by depleting vitamins and cellular stores of antioxidants. This is a factor even in people who don't have a "drinking problem"; breaking down alcohol consumes vitamins such as vitamin B6 and antioxidants, and if the cellular stores of these essential substances were marginal to begin with for whatever reason, such as OCD, the result is increased mental rigidity. When that happens, you are trapped. Pat needs N-acetyl cysteine (NAC) to restore glutathione levels as well as the antioxidants vitamin C, and vitamin E in order to overcome his OCD. As OCD is an anxiety disorder, nutrients that help include SAM-e (S-adenosyl methionine), vitamin B12, and
taurine; all of these have been clinically shown to help with depression as well which is useful to keep in mind if you aren't Pat (or even if you are).
It's God. God loves everyone. Including Pat. Nobody can possibly believe that compulsively arguing with trolls on Twitter can possibly be a fulfilling life. Pat, God can help you change your life. Pray to Him in the name of Jesus Christ, and ask Him to save you. He will guide you to a better life, if you will listen.
(Edit) Please ask me by private message if you need help. Even if you are Pat.