"Shut up" can be disrespectful depending on the context, tone, and relationship between the people involved. In many cases, it's considered impolite or rude to tell someone to "shut up" because it can be dismissive of their thoughts or feelings. It's generally better to express disagreement or ask for quiet in a more respectful manner.

context u talked about my mother i don't like you and I asked you to be quiet so "shut up"