It helps to know that he wasn’t using those terms as seriously as it appears. I think to a random person that doesn’t know everyone, it does look like a right-winger espousing his complaints about having to listen to “fucking libtards” express their dissent. Because, for example, my experience with people complaining about “PC” is when a feminist writes an article wanting to see less threats to women on the internet and she gets bombarded by “anti-PC” hate tweets.
I can just imagine the Freedom Fighters in the 1960s talking about civil rights for Black people being told, “Why are you always so politically correct? All you ever want to do is give these people rights. I should be able to call them n#$$%rs if I feel like it. We should be able to tell them where to sit if we want to. Things are fine the way they are. You liberal extremists are always trying to make us think and act like you do. This political correctness has gone too far.”