More Trolls and Time Wasters

Level 2
Is it me, or has the number of time wasters and trolls increased over the last year?

It seems like there are people on OfferUp who's sole purpose is to mess with other people.

I have people sending me nasty messages, setting up times to meet and then no response or being extremely passive aggressive.

How do you guys overcome this obstacle with successful sales?

Any constructive input is appreciated,
Cheers