Perhaps it has to do with the "anti-Sixties party." The Republicans declared war on the Sixties long ago, claim to have won numerous elections with this stance. To win a war--at least for Republicans--you need vitriol, and you wouldn't have to scrape the scum of right wing talk radio very long even today before you discovered some spit-laden hatred directed at the Sixties.
If only the Capitol Hill shooter had turned off the Rush Limbaugh show, seething with hatred for the disgusting pro-love, anti-war types, and played Destroy All Hippies! instead.
Right wing fucks.