It's a shame isn't it, because I define it as someone who listens carefully and is critical in sonic arrangement on recordings, relative to the recording medium and playback equipment.
It always seems to be used disparagingly or as a slur and perhaps some of it is deserved: I used to work with a guy who had a Naim CD player and would talk about how it had some balancing system for no jitter during data transfer from the laser read process, but was obviously clueless on the error-correction inherent in CDs anyway, making this mechanism redundant for the most part. He seemed to think it made the CDs sound better when in reality the original recording engineer, the mixing engineer, the mastering engineer and the pressing plant played more of a part that any of the CD player nonsense; I think he also used gold-plated cables, as if electrons somehow degraded when passed along copper wires...
Utter nonsense. As for me, I just learned to listen critically and identify mixing artefacts and compression oddities etc. which are more apparent on non-lowend audio equipment. Bluetooth speakers are the worst because they use acoustic coupling for harmonic reproduction and just generally sound unbalanced and bad.