“Why does vegan cheese taste bad?”/“It hasn’t been tested on mice.”

Mice eat cheese, but do they eat vegan cheese? A riddle is:
 
Q: Why does vegan cheese taste bad?
A: It hasn’t been tested on mice.
 
The vegan cheese joke has been cited in print since at least 2002.
     
   
Pathetic Veg*an Jokes (October 14, 2002)
Inspired by Paul WS
Why does vegan cheese taste bad?
It hasn’t been tested on mice.
 
May/June 2009, Vegetarian Times, pg. 12:
Why does vegan cheese taste so bad?
Because it isn’t tested on mice, -ISABELLE
 
Twitter
Edith Stewart
@EdithStewar
Why does vegan cheese taste bad?
It hasn’t been tested on mice.
12:59 PM - 15 Jul 2009
   
Twitter
Drusilla Bloeme
@DrusillaBloeme
@AuntieVera also, why is vegan cheese so nasty? It’s not tested on mice.
2:34 PM - 21 Oct 2009
   
Twitter
Jess
@jessyka19
Q: Why does vegan cheese taste bad? A: It hasn’t been tested on mice. i know i’m vegetarian and shouldn’t laugh but LOL. funny.
7:20 PM - 9 Mar 2010
   
Google Books
The Mammoth Book of One-Liners
Edited by Geoff Tibballs
London, UK: Constable & Robinson Ltd
2012
Pg. ?:
Why does vegan cheese taste bad?
It hasn’t been tested on mice.
     
Facebook   
Reader’s Digest
July 5, 2014 ·
Q: Why does vegan cheese taste bad?
A: It hasn’t been tested on mice.
 
Reddit—Vegan
Why does vegan cheese taste so terrible? self.vegan
Submitted May 2, 2016 by [deleted]
Because it hasn’t been tested on mice.
 
Google Books
Sh*ts and Giggles:
The Ultimate Bathroom Joke Book
By Katie Adams
New York, NY: St. Martin’s Press
2018
Pg. 137:
Vegan cheese tastes so bad because it hasn’t been tested on mice.
 
Vegan Food Lover
50 OF THE BEST VEGAN JOKES
July 20, 2018
(...)
Q: Why does vegan cheese not taste so great?
A: It’s because it never got tested on mice.