From the other side of the fence:
When interviewing, don't invite me to interview knowing full well you have already given the role to your son in law.
When interviewing dont look me up and down when i walk in.
When interviewing dont claim you have no records of the interview and dont know who i am when i have multiple professional emails feom your company inviting me to interview at said time date and location.
When interviewing dont have security lead me to your office and have them collect me and pat me down in my summer dress when i havent been anywhere alone the entire time i have been in the building.
When interviewing dont take the piss out of my name and dont tell me repeatedly how dainty i am.
When interviewing dont talk to me like i am 5 years old.
When interviewing dont make me travel to the other side of the country when i specifically tell you where i live, then when i travel and get there you tell me my interview is delayed by 30 minutes as you have to do skype interviews for other candidates who live where i do when i was never offered a Skype interview.
When interviewing dont ask one person out of a room of 20 to step outside and then simply say "we wont be needing you, bye".