Interestingly, I associate my guilty pleasures with things that people believe I should like based on certain personality characteristics of mine. For some reason, I don't want people to know my guilty pleasures because then they might believe I only watch a show, watch a movie, or read a book because I would fit into their media stereotype of who they think I am. Usually this revolves around my sexuality instead of any geeky/nerdy traits I have, so saying I loved watching Buffy makes me a bit more than self-conscious about it. Still, accepting that what you like (within a very murky moral view, ie no crime) and saying it out loud are sometimes hard to do.
As for irony...I probably misuse it myself a lot yet it's not part of my everyday vernacular. And the Internet, imho, has given us much worse things than the misuse of irony or Chuck Norris. For some reason I'm thinking of YouTube comments at this particular moment but other pointless things like cat pictures don't hold a lot of value either.