Yeah it surprises me very much. I'm a clean freak so I never share my drinks even with my family but manga characters avoid it for pretty stupid reasons.
How does that make her a slut? We guys talk dirty too.
Edit: later into the story I realise, she might not be a hoe but she's a literal pain in the ass.
Exactly. We wouldn't be reading manga if all we needed was a reality check. Ofc, it's bad if the story is too far fetched but atleast don't give us a shit ass ending in the name of realism.