Not very good at what, the game? Spare me.
Ok.
I'll ask you a simple question to get to my point - do you think Muugen makes that post if I were to instead react to his entrance by stating:
"Oh look, it's Muugen"
If Muugen *was* "playing towards me", it's only because I made myself amenable in the first place.
Now to be transparent, me and Muugen historically haven't gotten along in too many games - so by my own admission, *I* stroked his ego a bit, just to see what would happen. And no, this is not "backfilling", this is plainly just what happened - I challenge you to come up with another explanation for my behavior there.
So to the point - your interpretation of the situation is wrong and feels more in line with backfilling based on your premise of what alignments Me/Muugen are.