This is a fit for me, too. My H had some serious family problems, and he immediately went there when he left in August. He wanted their approval for everything all of a sudden, when for 20 years he'd rebelled (in many cases, rightfully so, in my opinion). I became the enemy that they once had been, and they were happy to join in that attitude, which hurt a lot. But I know it's not him.
Mine is definitely doing the "mimic" thing and opposite behaviors. He was a real individual; now, he has become his grandfather - literally. He often says, "It was good enough for my grandfather, so it's good enough for me." I liked his grandpa, who passed away 18 years ago, but he also cheated on his wife and distanced himself from those around him - just like my husband's doing.
His grandmother though, is one tough cookie, and is having none of this. I haven't talked to her, because I haven't had to. From what he's told me, I know she's standing too, and that the pressure he's getting from family not supporting the MLC is taking its toll. So I stand, and am encouraged that this is a good sign! Certainly, he wasn't this outward with it a year ago when he was in the throws of replay and I didn't realize it.