This is ad hominem. You are ignoring what is said and making a personal attack. That is what ad hominem is, ignoring the argument and attacking the man.
> Do you apply this...
This is ad hominem.
> I don't need to catalogue the fallacies to point out why this is not a good idea.
This is invincible ignorance fallacy.
That said, personally knowing someone is not necessary for psychological diagnosis. All it takes is a few details. I have never met President Trump, but I have no doubt whatsoever he has Narcissistic Personality Disorder simply because he meets the criteria. I have never met President Lincoln, but I have no doubt he suffered from Major Depression. Kanye's symptoms of BPD have been not only in the news, but in the headlines. It is not a difficult diagnosis, and if it took me a minute to realize it, it would take a psychologist seconds. And it doesn't take a psychologist to diagnose an obvious disorder any more than it takes an orthopedic to diagnose a compound fracture or a mechanic to recognize a flat tire.
Here's an example of real ad-hominem: "You are an obnoxious narcissistic piece of shit that thinks every disagreement is a personal insult because you can't stand not being right". If I were to use that sentence in an argument, that would be ad-hominem.
Asking whether or not you apply same standards of not using logical fallacies (from your original comment, I personally doubt it) is not ad-hominem because it's calling you out on asymmetric standards - apparently, you're free to commit logical fallacies as much as you want, but the moment someone else does, you halt all argument and just shout "ad hominem!" without any further elaboration and expect the other person to do the legwork of analysing how and why is the argument fallacious and fix it. That's not good faith discussion.
Incorrect, and this is ad hominem.
>>>>> impression of a deep understanding of
Who is being referred to? Who is being characterized? Certainly not no one. Thus, ad hominem attack.
> you're free to commit logical fallacies as much as you want, but the moment someone else does, you halt all discussion and just shout "fallacy!"
This is ad hominem. But it is also a straw man masquerading as tu quoque.
Also, fallacy fallacy.
> Kanye is a garden variety manic-depressive
> It is likely West has one of the more benign flavors of NPD
> I think his biggest problem is BPD and drug abuse
The rest of the post is either true-sounding-at-first, but completely meaningless claims, or completely obvious things that provide no insight whatsoever.
> NPD patients usually don't suffer
Completely false. Narcissistic injury is extremely painful, and one of the reasons narcissists lash out in the first place.
> [NPD treatment can] correct if not cure the disorder in under 2 years
Also not true. Narcissism is a personality disorder, and "curing" narcissism in 2 years is not common. Everything "can" be done, theoretically, but the implications of the sentence is that Narcissism is somehow special in that regard. It's not.
> but due to the combination with NPD and vast wealth, and probably being surrounded by those that will never deny him his insane impulses, he's probably not going to get help until he bottoms out in clinical major depression for months, if he survives it
So assuming he's NPD, his wealth and sycophants will lead him to destruction? Yeah, quite profound. He also has clinical major depression? Where did that come from?
"Psycho-babble" is a perfectly appropriate description of the original comment.
I don't need to catalogue the fallacies to point out why this is not a good idea.
This is also ironically vague and there is literally no ad hominem in there. Word salad is critique of the quality of the discourse, not of the person making it.
Also fallacy fallacy, just for good measure