Treat others with respect
Respect begets respect. You cannot demand respect if you do not treat others with respect. If others are being disrespectful, it is advised that you still treat them with respect.
This does not mean you are being a pushover, this only shows that you are in no way degrading yourself or going down to their level. Show them that they have dignity. Whoever the person is, they must be valued.

Treating everyone with equal respect is important in every aspect of your life. This shows that you do not respect people because of their status but because they are human beings who deserve respect.
Listen to others and validate their contribution. When you show people that you appreciate their contribution that means you are not power-hungry and not a credit grabber.