I would say many people are happy and eager to accuse someone of being a slut, no matter the number. This term has been weaponized for so long that it seems to have lost most of its punch power anyhow. Luckily, it seems to me that cultural norms are shifting away from these mindsets.
As far as considering someone for play or not, the explanatory power of numbers has little if any utility to me. They tend to give little insight into who a person is, and are highly flawed when it comes to predicting the quality or lack of quality an interaction is going to have. If a connection towards someone arises within me, it is there, high numbers or not.
Nice pillow! :)