Maybe I'm just too young to remember, but I've always been baffled by how the Clintons cause conservatives to literally start frothing at the mouth, even more so than Obama. The chud hate for Obama is understandable because he masqueraded as a progressive reformist. But, its more confusing with the Clintons because they are both right wingers.
Bill Clinton destroyed the last vestiges of the New Deal movement within the Democratic party and made it a fully neoliberal party, slashed welfare spending with Republican support, deregulated banks, and signed the crime bill which led to the mass incarceration of black people.
Hilary Clinton is a right wing warmongerer who made racist dog whistles during the 2008 campaign. Hell, she didn't even come out in favor of same sex marriage until like 2013.
It kind of makes sense why the Republicans hated FDR and Obama for more or less the same reasons. Truman was the same way too for a bit. I don't think LBJ got as much hate for some reason.
LBJ had personal connections to much of the same Republican establishment, and was pretty good friends with a lot of hard right Republicans. He also played dirty politics with the best of them, and was personally extremely corrupt (seriously, his election to the Senate only happened because a judge "happened to find" some 100 votes in a ballotbox, which he then "lost" when the official recount was supposed to happen).