“Why don’t they allow donkeys in school?”/“Because no one likes a smart ass.”

A school riddle is:
 
Q: Why don’t they allow donkeys in school?
A: Because no one likes a smart ass.
 
“I know a donkey with an I.Q. of 138! Hasn’t got a friend in the world. ‘Cause nobody likes a smart ass!” is a similar joke that was printed in a 1969 joke book. “Do you know why donkeys don’t go to school? Because nobody likes a smart ass” was printed in the Philadelphia (PA) Inquirer on September 4, 1979.
 
         
Google Books
The Ad-libber’s Handbook;
2000 New Laughs for Speakers
By Robert Orben
Garden City, NY: Doubleday
1969
Pg. 139:
I know a donkey with an I.Q. of 138! Hasn’t got a friend in the world. ‘Cause nobody likes a smart ass!
 
4 September 1979, Philadelphia (PA) Inquirer, “Music a city can strut to” by Tom Fox, pg. 1-B, col. 1:
“Do you know why donkeys don’t go to school?” he (Jimmy Murray—ed.) asked.
 
“Because,” he said, after a slight pause, “nobody likes a smart ass.”
       
Google Books
The Magic of Christmas
By Andrea Edwards
New York, NY: Silhouette Books
1993
Pg. 93:
“You know why donkeys don’t go to college?”
 
Her grin spread wider as she sat down. “Because nobody likes a smart ass.”
 
Google Books
The Year of Ice:
A Novel
By Brian Malloy
new York, NY: St. Martin’s Press
2002
Pg. 34:
When I was a kid he used to ask me: Kevin, why don’t donkeys go to school? And I’d have to say: ‘Cause nobody likes a smart-ass.
     
Google Groups: microsoft.public.windowsxp.help_and_support
prevent being spy
John
8/21/02
Hey Carey:  Here’s one for you:
Q:  Why don’t they send donkeys to school?
A:  ‘Cause nobody likes a smart ass.
 
Twitter
Todd Porter‏
@thesnuffy
Replying to @pagitt
@ysmarko & @pagitt Do you know why no one lets donkeys go to school?  Because no one likes a smart ass.  😊
4:26 PM - 15 Jan 2009
 
Twitter
Jennifer Spencer‏
@jennalyns
@dalecruse Know why they don’t send donkeys to school, Dale? Because nobody likes a smart ass.
7:49 AM - 8 Oct 2009
   
Twitter
Rachel‏
@rlavs
My gma, in response to an extremely clever remark I made: Rachel, know why they don’t allow donkeys in college? No one likes a smart ass.
1:02 PM - 3 Sep 2010
 
Google Books
The Almost Truth
By Eileen Cook
New York, NY: Simon Pulse
2012
Pg. 58:
“You know why they don’t send donkeys to college?”
 
“No one likes a smart-ass,” I answered.
 
Reddit—Jokes
Why don’t we send donkeys to school?
submitted October 16, 2017 by brenner7
No one likes a smart ass