When people are disrespectful or rude it pretty much never helps to join them in their behavior, and it focusses on the bad feeling they gave us. Focusing on positive ways to make a difference, or refuse to continue receiving (or generating) disrespect is kinder, and helps us build positive mindset that helps us cope in all sorts of situations.
Healthy boundaries are about responding with quiet dignity and controlling our reactions when disrespect is being shown.