When they say it they’re always seem to mean it as a compliment but I kind of get offended because of the connotation behind the term ‘nice guy’. And in the back of my head there’s that suspicion that they could possibly be making a dig at me.
I dunno, I feel like in the West being called a nice XX denotes that you’re weak, or insecure, or unattractive.
most people irl are not as internet poisoned as we are and lack the context around The Online Discourse(TM) so usually they mean it as a genuine complement