Many of the biggest whiners in the Senate about the supreme court are people like Harry Reid, and Patrick Leahy who slandered Bork for political reasons. Getting screwed over on a pick was overdue justice
You think rejecting Reagan's pick and forcing another was grounds for outright rejecting any pick from Obama, just so they could fill the seat themselves? Don't you have any idea of proportional response? Democrats forced a moderate back then, and this time Obama didn't even give Republicans a chance to reject a liberal pick. He just went right to a moderate, and your party still stole it.
You can try and pull all these flimsy historical arguments out of your butt all day if you want, but it's never going to justify what Mitch did. Escalating judicial battles like this is crazy and frankly, strategically unwise, because your party will not always hold all the cards, and I doubt Democrats are going to forget this in the future.