A “chef’s salad” is a salad construction by a chef. It is not a salad that a chef eats, but there are jokes.
     
“Winds us up that every restaurant serves ‘Chef’s Salad’. That’s the Chef’s salad. We want our own. Don’t want theirs. How does the Chef feel about this salad redistribution?” was posted on Twitter by Firebox.com on May 10, 2018.
   
This joke on Twitter by handsome handsock went viral (over 135,000 likes):
     
girlfriend: I’ll have the chef’s salad
me: [whispering] babe that’s so rude, just order your own
     
Similar jokes include “I ate a kid’s meal at McDonald’s for lunch. His mom was furious,” “I had a ploughman’s lunch the other day. He wasn’t very happy” and “I had a shepherd’s pie for lunch. He was furious,”
         
   
Wikipedia: Chef salad
Chef salad (or chef’s salad) is an American salad consisting of hard-boiled eggs; one or more varieties of meat, such as ham, turkey, chicken, or roast beef; tomatoes; cucumbers; and cheese; all placed upon a bed of tossed lettuce or other leaf vegetables. Several early recipes also include anchovies. A variety of dressings may be used with this salad.
   
Twitter
Firebox.com
@firebox
Winds us up that every restaurant serves ‘Chef’s Salad’. That’s the Chef’s salad. We want our own. Don’t want theirs. How does the Chef feel about this salad redistribution?
4:42 AM · May 10, 2018·TweetDeck
 
Twitter
handsome handsock
@handsock_butts
girlfriend: I’ll have the chef’s salad
me: [whispering] babe that’s so rude, just order your own
3:00 PM · Mar 12, 2019·Twitter for iPhone
     
Twitter
star丨
@sttaarrrrrrr
Tomoe: I’ll have the chef’s salad
Rinko: [whispering] babe that’s so rude, just order your own
11:49 PM · Mar 13, 2019·TweetDeck
   
Twitter
incorrect dnp
@incorrectphan
waiter: so what can i get you two
dan: i’ll have the ‘chef’s salad’
phil, nudging dan, whispering: dan that’s so rude. just get your own
11:18 AM · Mar 14, 2019·Twitter for iPhone
 
Twitter
styx✧
@hawkdabi
[at a restaurant]
sero: i’ll have the chef’s salad
kaminari: sero that’s so rude just order your own
10:09 AM · Apr 19, 2019·Twitter for iPhone
   
Twitter
incorrect treasure ✦
@treasure_texts
Junghwan, ordering food: i will have the chef’s salad please
Jeongwoo: omg that’s so rude just order your own
6:52 AM · Dec 1, 2020·Twitter for Android
 
Reddit—Dadjokes
Posted by u/porichoygupto March 26, 2021
My mom, ordering at a restaurant: I’ll have the chef’s salad, please.
Dad: Honey, that’s a little rude. Just have your own.