Similar to what others have said, comedy is a form of communication (or artform if you're reading the other comments; I'm riffing on this motif though).
If you can't convey your message (joke) properly, your audience is going to be pissed. There is a difference in saying 'carrots are a plague on humanity" and 'i just don't like carrots'. As tastes and sensitivities change, so too must the writer. literature, for instance, evolved in its composition. Earlier works from even the mid-20th century are wildly different in their writing style than modern stuff from the end of the 20th century; all due to reader preferences.