@Wendel-and-Patsy0 Well, you don't necessarily need to flag them, unless it's the same person bugging you. I have a friend who is a photographer and, coincidentally, an Airbnb host. Her advice is to charge way more than the nightly fee for this type of inquiry if that's what you want to do. Generally she discourages hosts from agreeing to photo shoots as they involve lots of people, equipment and most of the time they want to rearrange everything in your listing. You can respond with a polite "thanks but no thanks" and then Dismiss the conversation. That's it!
On the other hand, I know a host in the DC area that has allowed filming in his listing for House of Cards and it was quite lucrative. Unless it was a nationally known film company willing to sign a comprehensive contract, my advice would be not to do it.