New reporting from Politico reveals that President Joe Biden has nothing but sailor-mouthed contempt for former President Donald Trump behind closed doors, calling him a “sick f–k” and a “f–king a–hole.” The Trump campaign bristled at the news, with senior adviser Chris LaCivita saying, “It’s a shame that Crooked Joe Biden disrespects the presidency both publicly and privately.” But political experts were largely unfazed by the news. Indeed, some posted on X that this is just going to make Biden more relatable. “Works for me,” said psychologist Mary Trump, niece to the former president. Wan…