[spywaregorilla]

Be kind, listen, and demonstrate that you're listening.

[Throwaway8373]

This is still very cheap :) Be kind in the sense of the bible? Well, then you'd have the have read, or at least be educated, in the bible.

If it was just so simple as to be a good listener. Then I think a lot more of the classic "nerds" would have hit it of hard with the ladies ;)

[spywaregorilla]

Nerds are, imo, stereotypically terrible listeners.

It's pretty difficult to fail to classify kind behavior imo, barring people with exceptionally poor empathy skills

[ben_w]

Most people familiar with the phrase “good Samaritan” or “going the extra mile” won’t demonstrate such behaviour.

Instead, although “nice” almost certainly has some culturally specific Shibboleths, I would say the basic test is where someone is on the selfish-empathetic scale, and further to empathic is a good thing in a partner.