The problem is that it is. Any such rule of thumb is discrimination. Even if you had some magical way of knowing whether given guest will destroy your apartment with perfect certainty, using that to filter guests will still be discrimination.

Trying to eliminate discrimination always ends up by removing any kind of ability to choose your customer.

AirBNB lists several specific types of discrimination their policy forbids - discrimination against "locals" is not one of them.

https://www.airbnb.com/help/article/1405/airbnb-s-nondiscrim...