HPL most definitely did not hate being around other people. He attended conventions of amateur journalists, hung out daily with his pals in New York during the time he lived there, travelled up and down the East Coast to visit his friends -- people would invite him to stay for weeks and even months because he was such a fun guy to be around. Listen to what E. Hoffmann Price (who knew him) said of him attending a party in New Orleans:After watching several documentaries and reading some of the letters he wrote that were published after his death, he seemed to be an avid avoiders of all things people. Seems it would be hard to be a freemason when you hate being around other people...
If you like Lovecraft would suggestI'm a die hard Lovecraft fan, but not sure if I ever heard about the Mason thing before. Methinks I should seek out a written biography soon. The man himself is surrounded by legend and mystery, after all.
I remember watching a pretty cool documentary on YouTube recently on HPL. They talked about him in great detail, though I don't remember anything at all being mentioned about involvement with the Masons. I might have to watch it again soon and see if I missed some things.
His wife sounded really cool and ahead of her time, though. She also helped squash some of his racism.