Good for you.

There’s no reason not to be positive to the kids on both teams. When I coached, I had two rules: (1) have fun, and (2) respect (for yourself, for your teammates, for your coaches, for the umpires, for the other team). There is always room to encourage your players (“way to track the ball — remember, keep that glove in the dirt. You’ll get it next time.”) and the other team’s (“heck of a catch, shortstop! Nice play!”). Seemed pretty simple to me.

Edit: I was fortunate that the parents on our low-level rec league team generally agreed with me. I used to tell them that none of their kids were the next George Brett and that the goal here was to have fun, teach teamwork, and give the kids some skills so when they played on a coed softball team for the office, they'd acquit themselves nicely.