Nusa, this was sarcasm.
I'm the one who likes to tell jokes about Finns, because they're funny, and highlight something typically Finnish, that either tends to apply to most Finns without them realizing (the "I wonder what that elephant thinks of me" joke), or only applies to very few Finns but everyone thinks its true ("The Great Misfortune at Lake Inari" joke about drinking Vodka in a snowstorm).
The funny thing about stereotypes is their absurdity. It is exactly the absurdity that makes them funny.
(Which is why I like comics by Jukka Tilsa: they're absurd to the extreme. Like in Space Pants, where a guy starts sawing a tree that is actually a shapeshifter from space, and turns into a giraffe. The guy's friend shouts him to stop sawing the giraffes leg, but they guy answers he can't hear anything as the saw is making a rah-rah noise, you see.)
Because it is the absurdity that makes them funny, nothing should be outside the realm of humor. If we say that for example burning babies is not something that can be joked about, we are diminishing the world we observe, and moreover, the scope of things we question about ourselves.
If you want to combat a stereotype, the actual working method is to show its absurdity: taking it and running with it to the extreme.
Telling someone they're being bigoted is not effective at all, but taking their preconceptions and letting them realize how bigoted they are, even if through humor, is.
Me, I'm very bigoted. I'm big on off topic stuff.