If your child has many difficult behaviors, including disrespect, I would recommend focusing on the other behaviors first. If your child is being disrespectful just to get a reaction from you, then just ignore it.
However if that is not the case, and when you are ready to focus on disrespect then try a few things:
-be respectful to your child (don’t call them mean names, belittle them, etc).
A lot of parents don’t realize that they are being disrespectful to their child. This doesn’t mean we treat child on same level authority-wise as adults, but think about would we talk to our friends or spouse the same way we address our kids? If we can talk nicer to them they will often respond nicer back.
-expect respect, and correct them by having them try again in a better way. You model/say what the child should say instead of what they did say and have them repeat it back. [See article on error correction]
-provide a consequence for constant disrespectful behavior [see article on consequences]
If disrespect continues then you might need to figure out what’s gone wrong with your relationship with your child/teen and work on that. In order for children to follow directions and be respectful, etc parents MUST have a good relationship with their child. Relationship is the MOST important thing!! Many teens will say their parents are mean to them or disrespectful so they refuse to listen to them. Or they feel their father (for example) doesn’t have a relationship with them so why would they listen to him. If you don’t have a good relationship with your child work on that relationship FIRST before expecting better behavior or more respectful responses.