Oh, don't get me wrong, I don't need to be a pro to talk trash. When I'm on the basketball court or sparring someone or whatnot, I'm nonstop trash talking...even when getting my ass handed to me.
In this case, it's a lack of comfort, brought on by my lack of confidence. When I become a little more confident in my writing, I'll also feel more comfortable, which will then manifest itself in some smack talk. Being as this is only my second time doing this (I was ousted in the first round last time) and only the second short story that I've written in over 20 years (CDM spring '07 being the first one), I feel funny talking much trash.