They all do this, right? It's OK to breezily ignore his whining?
He doesn't mention anything specific beyond hating school because it's boring, he has to sit sill and learn his ABCs. He enjoys playtime and seems happy enough (for a mournful, dramatic child, it's all relative). His teacher says he's doing fine and is quite bright.
Plan of attack is to jolly him along and not pay much attention to it, unless MN says otherwise.