Sure, dive bars still exist, but they're not as common as they used to be, and that makes them even more worthy of your attention and affection. That Econ 101 class in college I actually stayed awake in taught me that scarcity can be very good for business. If there were a dive on every corner, would we even care? Would we fetishize its aesthetic, and the old guys still hanging out at the bar? Probably not.
Despite all that, it's your right to love something shitty
I fully accept that some people love horrible things that I hate -- Kid Rock, karaoke, and doing karaoke of Kid Rock's "Bawitdaba." But it's when people try to justify their love of dive bars by saying they have character, or because the booze is cheap, or that the people who work there are just the best, that I just have to shake my head. Dive bars suck for those exact reasons. You can find me at a shiny new bar instead, with friendly bartenders and an ambience not created by neglect -- with a good craft beer in hand.