Deep down inside, maybe Hitler loved communists. Deep down inside, maybe Hitler loved Jews.
But, his hatred of communists and Jews sure seemed to be sincere. ;-)
Nazis hated Communists for the same reason that the Bloods hate the Crips.
His hatred of communists wasn't due to their being communist, as much as their having allegiance to the USSR. Hitler didn't dislike socialism, he just wanted to be in charge and was against competitors for leadership.