(1) calls me a stalker because I keep sending messages to him (but that's not what "stalking" means, so this accusation can be ignored)
You're not a stalker for sending messages to a teammate in a game.
(2) calls me a micromanager because I keep giving him advice, and he supposedly knows how to play the game. Except he doesn't: since the game started, he hasn't conquered a single bonus despite multiple opportunities to do so and got about 400 of his armies cut off and eliminated in total (on 3 separate occasions) because he doesn't understand the connected commanders mod. Yet he refuses to accept advice.
Some people won't learn or listen. They don't have to either. If you dislike playing with them, blacklist them and move on :)
Making a thread accusing someone of being a stalker however, that is petty. OP should reflect on himself instead of going out of his way to be an arse to others on the forums.