[rocky1138]

That's probably a cultural thing. In some cultures, red is superior to green.

Really, it's not about them being better or worse than a user with more Karna. It's just a signal to everyone that this person might be advertising or AstroTurfing.

[parmesan]

What?! I didn't know it indicates that the user is "untrusted", I'm from Sweden and my impression has been that the green users are super users of some kind.

[ateesdalejr]

That was my impression as well. I never knew that. Guess it's good to know though.