I had a similar situation when the keyboard player in our band started telling me what I should play. Problem is, he was always wrong. He suggested a shuffle pattern on a song that wasn't a shuffle and it couldn't be played that way. I very politely told him I'd make a deal with him. I won't tell him how to play keyboards and he doesn't tell me how to play drums. I then told him that I was going to play the parts in the songs that I'd come up with OR what the MD directed me to play. In three years the MD has made two suggestions to me that I adopted and the song was improved. The band depends on me to drive most of the songs and I certainly don't need help from someone with bad rhythm and no feel for percussion. The last two bands I played in the lead singer/guitarists were also very good drummers. Not once did either of them try to change my playing. Sometimes you have to stand up for yourself while still being open to musical discussion on how to improve the song performance.My 2 cents:
Could be a lot of things....... probably only one thing. (and it may be more about him than you!)
I'd lean toward a one on one with him and see where that leads. Also, you may consider asking yourself what the best possible outcome would be, and then ask yourself what can you do or say to move things in that direction. Ultimately, you can only be responsible for yourself.