Earlier quoted context omitted.
Newton was an asshole in an era when men being assholes was, in essence, acceptable. There is no evidence that being an asshole is a requirement for being a successful innovator or leader.
It takes effort to be not be an asshole because you have to expend energy to model and simulate the feelings of others outside of you. That's an objective fact. Being a genius may require not expending such energy. Of course there are other geniuses that find things easy and they behave very nicely, but then they may not be reaching their "true" potential, heh.
It's really hard to respond effectively when someone is doing the WRONG thing or they completely misunderstand your stance & modus operandi.
It takes a lot of effort to mentally model the other parties in the conversation and generate the empathetic response that hopefully is interpreted by the others in exactly the way you intended, so that everyone is back on the same page. An impossible endeavour.