For me: childhood.What's your favorite thing about the 1980s?
These are the things i like.
... Mullets, Big Hair, Flat-tops.
... Earrings worn by men in their left ear.
... Lace Fingerless Gloves for women.
... Bright vivid colored clothings.
... Synth and Rock music.
... Oh, and the porn too was great.
There were some gems for music, but the music generally sucked. Alternative music was called "alternative" for a reason: the radios generally didn't play it. Mostly, we got stuff like Christopher Cross, the Pointer Sisters and Whitesnake.
There's one thing that I associate with the 80s more than anything else: the nasty cigarette smell in every public place. Not the smell of smoke itself, but that smell that drywall, upholstery and paper give off after absorbing cigarette smoke for a few decades. I don't smell that smell very often any more, but when I do, I'm instantly transported back to the 80s.