There are many ways to handle a customer who is being rude or disrespectful; there are also many ways to avoid them. Therefore, it is extremely important to try to get to know his character during the first conversations.
The first thing to do if we have a client who is being undesirable is to remain calm. Later, in a polite way, tell him that his behavior is being inappropriate.
While this may not result in any change, we can indicate to the client that we are ending the appointment. If this does not work or her behavior does not change, we must approach someone who is close to us, leave the place and tell someone we trust where we are and what the situation is.
As a last step, we can communicate with the security of the place or the police.