Carrot, stick or mum's the word?
I play doubles with a lot of different people. When things aren't going well for me/us, different partners handle it in different ways. Some partners admonish me to play harder/smarter/better, others are supportive and encouraging, perhaps suggesting that we relax or something along these lines, while still other partners say nothing (or chat about other things).
Personally, the supportive people work best with me. The admonishers get listened to the first time, but if they keep it up I ask/tell them to stop. The quiet folks are fine too, because I'm already working my arse off trying to figure out how to win more points.
Which type of partner works best for you?