Since you are asking... July 2011 is right for the join date and some time later is when I voiced any opinion related to the QM sequence and MWI (I did read through it once and browsed now and again since). No, I did not have another account before that, as a long-term freenode ##physics IRC channel moderator, I dislike being confused about user's previous identities, so I don't do it myself (hence the silly nick chosen a decade or so ago, which has lost all relevance by now). On the other hand, I don't mind people wanting a clean slate with a new nick, just not using socks to express a controversial or karma-draining opinion they are too chicken to have linked to their main account.

I also encourage you to take whatever wedrifid writes about me with a grain of salt. While I read what he writes and often upvote when I find it warranted, I quite publicly announced here about a year ago that I will not be replying to any of his comments, given how counterproductive it had been for me. (There are currently about 4 or 5 people on my LW "do-not-reply" list.) I have also warned other users once or twice, after I noticed them in a similarly futile discussion with wedrifid. I would be really surprised if this did not color his perception and attitude. It certainly would for me, were the roles reversed.