This is how Mario Kart 8 DLC works online.

[Lonely_Dolphin]

RolStoppable said:

Einsam_Delphin said:

Feel free to explain yourself anytime!

ktay makes joke, adds note to signal that it is a joke, thus no sarcasm that may or may not be hard to decipher.
Delphin gets defensive and posts rebuttal regardless, despite knowing that "jk" stands for "just kidding".

Except I wasn't responding to the joke. The online playerbase being split is fact as not everyone will get the same amount of DLC.