Who would expect that? It's a old cliche that explaining a joke isn't funny or entertaining. I certainly wasn't expecting humor when I looked at it.
(Nor did I find any, but then, the "it's funny because it's not funny" shtick is right up there with "Bill Clinton is a horny guy, amirite?" jokes in Dated Gag Heaven.)
Now, if there were an additional level of description, something could be salvaged.
"The writer of the explanation characterizes a 'full rugby uniform' as lacking any trousers, belt, or shoes to invoke homophobic stereotypes about the English."
...Meh, maybe not even that would help.
If this were some other kind of writing, like a forum post or a blog entry, no problem, stuff like that wouldn't faze me. But I think you have to clear a high bar in quality if you're writing some sarcastic & condescending criticism of something else... especially when the "something else" is already aiming at a (relatively) highbrow audience. Otherwise it's not credible to me and not funny.
The blonde girl calls megan’s boyfriend and convinces him to make some delicious nachos. However, he doesn’t know that the blonde girl’s real motive was to kill megan’s wifi signal with the microwave he uses because they were playing a first person shooter video game against each other over the internet, and the blonde girl wanted to kill her.
If you're going to write something scathing about how foolish thing X is, you had better make damn well sure your writing is actually better than thing X. This reads like a bright 12-year-old posted it (but not that bright.)