I cant believe nobody mentioned that this is a sharking method. I know a guy who will cheat you every which way he can and he puts the chalk down like that because he knows it bothers people. For bangers its a mistake they dont even know their making but for real pool players, their trying to shark you.
There is someone that I play with frequently who I suspect is doing so for just this reason. He's been playing too long to not know the difference, and he places it upside down, specifically...
I've grown to ignore it. My hands end up blue no matter what I try, so I've just accepted it to be part of playing pool. I get distracted too easily as it it to allow myself to dwell on how or where the chalk is. (Mine is in my pocket, so I don't really care about the stuff on the table any more, even when it gets on my hands.)