Barack Obama can't believe that HE lost to sleepy Joe either. Or have leftists forgotten that Joe Biden -- who didn't really even campaign -- 'got' vastly more votes than Barack Obama ever did after hiding in his basement for half a year? Oh right, they are collectively NOT reminding themselves of that 'fact', since doing so would cause them to 'think' and thus intellectually challenge the political narrative of their party leadership.
Obviously the Left combined political forces with never Trump RINOs to 'give' Joe Biden the 2020 election via massive vote count cheating . . . and sheeple leftists are just fine with that. There was a reason that Joseph Stalin contemptuously called liberals, progressives, and leftists in general his 'useful idiots'.