Actually thinking about it, most people can hold a conversation, although it might be a bit awkward and geeky. But about 30% won’t or aren’t able to adhere to social norms in doing so. That might be because they’re incredibly immature, don’t understand social norms because of Aspergers or the like, are extremely shy, very sheltered, or multiple reasons.
That said, most people I’d categorise thus aren’t necessarily academically gifted or even particularly intelligent (not to be a dickhead, but you get a lot of utterly moronic and repetitive conversations online between about 5 people in this category on a loop. Sample - 1: “Wigan scum” 2: “Man U scum” 1: “I’m not scum” 2: “yes you are hahaha” 3: “you’re both scum” 2: “NEVER” 1: “who are you ?” ad infinitum). But, yeah, some of them are great at anagramming, although not necessarily the top players there are.