I'd actually avoided putting my Super-Community-Manager-Diamond-Hat-of-Doom (+355 in case anyone from rpgrpg was wondering) on in here until I saw this post. But, you convinced me to do it, so here I am. I have also appointed myself the Queen of Bluntness until some other Community Team member sees fit to depose me.
Joke answers have extreme negative value here. They destroy our signal/noise ratio, which is one of the most important advantages of the SE format. Anna was being very nice by letting it ride to see if it was turned into anything useful. When it wasn't, she tried to close it in a polite way, rather than going "Jokes are for forums, KILL IT WITH FIRE!!!" on you.
Pointing out that your answer was argumentative (which it was) is nicer than saying "joke answers are a drain on the community, please learn to do something constructive while you are here". (My thoughts there -- I'm not speaking for Anna.)
We try really hard to be nice here, even when users (especially new users like you) do something that isn't good for the site. One never knows where really great contributions will come from, and often they come from someone who behaved one way before they really grokked the ways in which SE is different from, well, everything they are used to, and an infinitely better way after they got it.
TL;DR: A ridiculous amount of the internet (almost everything that's not porn, and some things that are) is devoted to humor. Stack Exchange is about something else -- being a place to find answers when you need them, and pay it forward to other users -- so stick around and get a feel for how things work here. I bet you'll find it valuable.