At Perform we use this game to encourage the children to express their feelings, but in a respectful way.
Give your child a situation which you are going to play out together. You might decide to use a particular situation in which they behaved disrespectfully recently.
Set out the scene and give your child the emotion which they need to react with - for example they want to go to the park, but you say that they have to go shopping instead. They might be disappointed, and it's fine to communicate that, but they should try to do so in a respectful way.
This will help encourage your child to express their feelings and get their point across, without being rude. Once you've played out a situation you can then talk about how it went, and how it could be further improved.