Why? I loved reading something that was heartfelt and unfiltered. Does everything have to be sanitized to that it doesn't offend anyone's sensibilities? Because I find that offensive.

Being coarse on purpose to express yourself is perfect valid. It's not like he's being asked to critique Schopenhauer and his reply is "Fuck that shit." He's responding to having years of work rendered moot for no apparent reason beyond one man's preference.