I often watch rival games in my competitions to try to gauge their performances. In these games, I never add my support to either side, even if one of them is a friend. I did "support" a friend in a league match 2 seasons ago, when he was playing the league leader. But I noticed after that, every league game I played, the leader came and watched, and supported my opponent, whoever it was.

I do "support" friends sometimes when they are playing, but NOT in any of my competitions.