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This is purely my opinion, and if other people ( @Debator and @Dracul )want to weigh in their opinions that would be great:
A conversation between people on a certain topic -> A-Ok
A discussion in which people are becoming more heated in their replies. -> Still ok
The reason I tend to say I dislike arguing is because arguments tend to involve trying to get a rise out of the other people, which in turn pushes the argument towards a fight.
When an argument goes too far, and either derails into name calling, or personal attacks. Not ok.
'Yo momma a poopoo head' -> Not ok
'You're idea is stupid' end comment.
I define negativity as unhelpful/unconstructive comments. Generally these tend to be flagged as off topic or community members will call the person out on it.