I mean, if there's an issue with the skin (epidermis/dermis) then it's 100% dermatological. Like I said, part of it does have to do with hygiene. Diet is another factor: peanuts, colas and chocolates are three big ones to avoid if you're trying to clear your skin. Even the cleanest people can get breakouts. Even the most diet conscious people can get breakouts.
Pills and topical treatments can add up. I'm speaking from experience.
I agree with you on people that have issues like that. No argument here.
I'm speaking purely from the POV of someone who has body odor because a lack of washing. Greasy, matted hair with dandruff flakes and/or dried hairspray all throughout because they don't wash it. Teeth covered in plaque because they don't brush and the fecal matter-scented breath that accompanies it. Clothes that haven't been washed in ages where they smell like a wet mop that sat too long and soured. This isn't an issue with a skin condition. It's called being slovenly. And if you can afford to buy collector's editions of videogames at their midnight launches, you should be able to afford some off-brand body wash, a toothbrush, toothpaste and laundry detergent. That stuff costs about $8, even at today's prices at Wally World. 
Holy, Hopping, Heaping, Hostile & Harsh Heaps of Hyperbole, Batman! 
Many people who are severely depressed, have been traumatized/are experiencing & dealing with PTSD, going through & battling alcohol, gambling, drug & pretty much almost all other addiction problems, and/or are mentally, emotionally, developmentally, etc. disabled, challenged, or disturbed would also fall under your big, fat umbrella - painted with that even bigger & fatter brush...symptom & behavior-wise.
Getting frustrated, upset, impatient, annoyed, angry, etc is all fine
Tearing-down, ripping apart, judging, and (trying to) elevate yourself & feel better by belittling others w/o knowing anything other than some basic stereotypes...is *not* really quite so fine, appears very 'High-School-ish, --and-- IMO, smacks & *reeks* 
a bit of immaturity, close-mindedness, and just plain-old kind of being a bit of a prick & not a very nice person 
Whatever.
Like I said, nothing but my opinion 
and...you *did* ask us:
"what we all thought"? 
I wasn't trying to tear anyone down. I understand and have dealt with people with a diminished mental capacity, health issues, etc on a daily basis at work for the past 18 years. I wasn't trying to cast an umbrella over anyone or everyone with issues. Nor was I in any way trying to elevate myself. If anything, I despise people who think they are better than everyone else and I lead a pretty simple life focused on my family and raising my girls to be respectful young ladies. I've also dealt with more than my share of loss and grieving. I hope nobody has to experience the pain of becoming a widow/widower at a young age. Or losing your best friend, your uncle, all of your grandparents and great grandparents from a close-knit family in the span of a decade.
Everyone has their own way of coping with life. Some turn to drugs. Some to drink. Some to murder and some to suicide. I also work in a very depressing environment,again for 18 years and counting. Does this make me a psychology expert or give me insight into people's personal problems? No. I'm no guru.
But what I was speaking of is a man who is filthy, exactly as I described. He seemed pretty happy, smiling and yelling WOOOOOOOO! as he showed off his new game. Irregardless of any life issues he may be dealing with, he was filthy and "reeked."
Does that make me judgemental? I guess in this case yes. But just as smoking is banned from most stores, shoes & shirts are required and no firearms are permitted on many premises, people shouldn't have to be subjected to stench because someone chose not to bathe.
Have you never felt shame or embarrassment because you were perceived to be with someone or part of something you weren't? Never had to tell anyone something they needed to correct? We're they all of diminished mental capacity, suffering depression, etc?
This guy was shameful. Not because he was a gamer, poor, had issues, etc. he was shameful because he chooses to be a slob and to stink. Not talking about uncontrollable acne, sweating or other clinical issues. He chooses not to bathe or brush his teeth and to be the way he is. Period.
