Yasha: I don't see where the favoritism is in your situation. The thread that didn't get locked was there first. Yours was unnecessary. The mod that locked it didn't have anything against you.They were just knocking out a redundant thread. Had your thread been posted first and someone else posted it again, your thread would have been left and the other locked.
As for your "How I feel like it at the moment" method, if that's what you call a judgement call, so be it. These mods are volunteers and do the best they can. Sometimes they make a boo boo and in those cases, they'll fix it. Your thread lock was straight forward. There's no conspiracy here.
Sometimes users disagree with a decision. Goodness knows I have in the past, and may do so again, but the bottom line comes down to the fact that we have to respect what they decide. This is a private forum and subject to such moderation, and no one is holding you here against your will.
JMHO. 🙂