If you mean people who are annoying and complain about everything, here are some tips.
- don't overreact. If you overreact, they are most likely going to complain about the job and you. And that's the opposite of what you want.
- keep them occupied. If you do that, they will be absorb bed in their own job too much to complain.
- don't blame them. As much as they are annoying, you can't blame them for anything. If you do, they are likely to again, annoy and complain.