Driving in the bike lanes

I'll start by saying I get that bike lanes are unpopular with most people, but is that really your excuse for using them like your own personal shortcut?

I'm not so much worried about using them for right turn lanes cause it can relieve a lot of traffic but yesterday there's a car 100yards in front indicating to go left and as soon as I touch the brakes the minivan behind is trying to go around. Like dude, I can see he has a clearing to turn and now you're just going to be driving next to me in a bike lane. Unsurprisingly I got flipped off for not letting that asshat over take me.

Does this belong in the unpopular opinion sub? Is it actually perfectly legal to drive in the bike lanes and I'm the asshat? Do these people spontaneously combust when they drive downtown and there's bike lanes, one-ways, and street parking?