Smart people can be fun to be around - if you can follow them. If next to everyone was at least 10 points higher than you, then you're always going to be the slow one trying to catch up & figure out what's so funny. (The situation is even worse if the hypothetical situation shifts the whole bell curve out.)
If you think 10 points isn't a big enough difference to matter socially, then I have an experiment for you: take on a similar handicap and see how much fun your favorite social group interaction is; I suggest that you put in some loose ear-plugs to approximate being hard of hearing.
(My experience is that a ~10 points deficit in the other people makes up for my bum ears as far as understanding & participating in the flow of conversation, so I reason that it should work the other way around.)
I find that a lot of joking around with smart people relies on shared experiences more than on-the-fly applications of intelligence, just as it does with less smart people. For instance, my Plato's Republic class was chatting about how silly one of the translations we aren't using is, because it translated something that our version renders as "baking cakes" to "managing pancakes" instead. If I want to crack up that particular group of people, I can do it by mentioning that I managed pancakes for breakfast; I don't think that would ha...
There was some talk here about height taxes, but there's a better solution - redefine shortness as a treatable condition and use HGH to cure it. They even got FDA on board with that, at least for 1.2% shortest people.
Unsatisfactory sexual performance became a treatable condition with Viagra. Depression and hyperactivity became treatable conditions with SSRIs. Being ugly is already almost considered a treatable condition, at least one can get that impression from cosmetic surgery ads. Being overweight is universally considered an illness, even though we don't have too many effective treatment options (surgery is unpopular, and effective drugs like fen-phen and ECA are not officially prescribed any more). If we ever figure out how to increase IQ, you can be certain low IQ will be considered a treatable condition too. Almost everything undesirable gets redefined as an illness as soon as an effective way to fix it is developed.
I welcome these changes. Yes, redefining large parts of normal human variability as illness is a lie, but if that's what society needs to work around its taboos against human enhancement, so be it.