Another example are the biases which freely and unabashedly show up in the Song Request sub-forum. Some of us are into the same overall genres but different periods, e.g., classic country vs. modern country.
Just in case the decade of music that you truly love isn't one like the 70's, i.e, one that garners praise for its 'quality' of music and performers, here's a discussion of why you like it anyway; "Neural Nostalgia: why do we love the music we heard as teenagers?" http://www.slate.com/articles/health_and_science/science/2014/08/musical_nostalgia_the_psychology_and_neuroscience_for_song_preference_and.html This is a fun read and I no longer feel quite as silly about my affection for some of that Oldies stuff. :D
"It takes a lot of devotion and work, or maybe I should say play, because if you love it, that's what it amounts to. I haven't found any shortcuts, and I've been looking for a long time."
-- Chet Atkins
-- Chet Atkins