How to respond to disrespectful people

Disrespectful people, no matter what label they give themselves,
  or what they claim to believe,
shouldn’t be engaged in conversation
  or acknowledged in any way!

They are, ultimately, trolls, and best ignored!

To respond to them only sends the message
 that acting disrespectfully is OK,
  and shows that you are willing to tolerate it!
This is a big mistake and will only encourage them
  to become progressively worse!