I like soloing in MMOs.
I like the gameplay, progression, and exploring the world. I don't play them because I want a shitty chat room or to socialize.
The only time I was "social" in a MMO consistently was when I got into the market and trade side of things in one MMO and was in a guild with like minded merchants.
But again it was less socializing and more trading market information and the like.
If I do group content I just group up with randoms or use the inbuilt match making to aid in finding a party.
If I wanted to do the whole social thing then I would play a purely social game like VR chat or to a lesser extent second life.