This is, in my humble opinion, utter bullshit.
Now don't get me wrong here I am accepting of a lot of things. Social awkwardness, various quirks and odd habits, a lot of what gets some people ostracized from other circles I am fully aware of dealing with and allowing at my table. The ones I am talking about here are the ones who go far and beyond the average 'geek' who isn't familiar with interacting with people on a normal basis. The ones who continue, or in some cases increase, their strong anti-social tendencies even after you've sat down and had a talk with them about it.
The guy who seems okay at some points but hits on every female that comes around... as long as they are underage. I've seen this one at a local game shop, he was in his mid twenties and he seemed to like the ones who either weren't old enough to have a drivers license or just got one. Really creepy pedo factor every time I was near him.
Or how about the overly violent bully. He sees all the other players as inferior or stupid, usually the GM as well. Yells at other people for the decisions they make, threatens physical harm if they make a bad die roll. Usually states that he is the only one at the table with any form of intelligence quite loudly to the other people.
The drug addict who is always trying to get other people to join in with his habit. The kleptomaniac who thinks what is yours should be his and has no problem taking it. The guy who absolutely refuses to bathe that people on the other side of the room can smell. The ones who really push the boundaries way far and beyond their limits. Those folks are who I'm talking about.
What's my asshole gamemaster advice here? Kick them the fuck out, plain and simple. Their reputation will rub off on you and the rest of the group even if you don't want it to. Potential players may avoid your games because of a single individual at your table. Folks outside of the gaming hobby will notice the company you keep as well. Trust me, reputation is a big deal out there in the world. Not to mention legal repercussions from folks like the drug addict or pedophile types. Do you really want to testify in front of a court room that you've seen somebody dating underage girls for the last two or three years... and never reported it.
We don't have to accept everybody. Some people just cannot and will not fit in.