Word meanings and "nice guys"

I talked a bit about changes in word meanings in a previous post. I'll give an example.

I assert most planetside Matari would consider "a nice guy" to be somebody who is nice to other people. An Angel Cartel loyalist would not be "a nice guy" because they seek to extort, enslave and kill other Matari.

Many Matari capsuleers, on the other hand, seem to use "a nice guy" to mean "somebody who is talking pleasantly to me". They seem to attach to the words no requirement to actually be nice to other people. Sometimes not even the requirement to be very nice to the speaker himself, the words may just mean said person is entertaining company.