The 2019–20 coronavirus outbreak came with many public announcements to wash hands. Many people had learned this in kindergarten (at the latest).
       
“Since everyone is now washing their hands like they were supposed to, next week we will be working on shapes and colors” was posted on Twitter by Melissa on March 14, 2020. “Now that everyone is washing their hands, we will work on shapes and colors next week” was posted on Facebook by Lee Harkins at about the same time.
     
“Now that we have everyone washing their hands correctly. Next week: turn signals” is a similar joke.
   
         
Wikipedia: 2019-20 coronavirus outbreak
The 2019–20 coronavirus outbreak is an ongoing global outbreak of coronavirus disease 2019 (COVID-19) caused by the SARS coronavirus 2 (SARS-CoV-2). The disease was first identified in Wuhan, Hubei, China on 1 December 2019, spreading to every province-level administrative division of the country by 29 January 2020. On 30 January, the World Health Organization declared the outbreak a Public Health Emergency of International Concern following an increase in the number of cases outside China.
     
Twitter
Melissa
@MelBear26
Since everyone is now washing their hands like they were supposed to, next week we will be working on shapes and colors.
11:55 AM · Mar 14, 2020·Twitter for iPhone
           
Facebook
Lee Harkins
March 14, 2020 at 12:05 PM ·
Now that everyone is washing their hands, we will work on shapes and colors next week.
 
Twitter 
Tenacious “T” will resist - #TeamDems #JoeBiden
@WillResistAdmin
Since everyone has begun to wash their hands,
like we’re supposed to,
we’ll move on to shapes & colors next week.
1:57 PM · Mar 14, 2020·Twitter for iPhone
 
Twitter
Ali
@AliSilversmith
Since everyone is now washing their hands like we’re supposed to, next week we will be working on shapes and colors.
6:58 PM · Mar 14, 2020·Twitter for iPhone
   
Twitter
Julz Rulz CHIEFS Kingdom
@hagalicious813
Now that y’all have relearned to wash your hands we will work on colors and shapes next week
10:13 PM · Mar 14, 2020·Twitter for Android
   
Twitter
Johnny Deplorable ●
@RedWingGrips
I’m glad to see everyone has begun washing their hands like they were taught to do so at the age of 3.
Next week we’ll be moving on to shapes and colors.
7:55 AM · Mar 15, 2020·Twitter for Android
   
Twitter
Sean White USMCSDI
@USMCSDI
Since everyone is FINALLY washing their hands like they’re supposed to, next week we will be working on shapes and colors
10:57 AM · Mar 15, 2020·Twitter Web App
 
Twitter
kobe
@httpkobee
Glad to see some of y’all are learning to wash your hands! We’ll start on ABC’s, shapes, and colors next week
7:25 PM · Mar 15, 2020·Twitter for iPhone
 
Twitter
Broken Puppet
@java_assassin
Since everyone is now washing their hands like we’re supposed to, next week we will be working on shapes and colors.
5:47 AM · Mar 16, 2020·Twitter for Android
   
Twitter
hiba
@iatemuggles
since everybody has started washing their hands like we’re supposed to, we will be working on shapes and colors next week
4:36 PM · Mar 16, 2020·Twitter Web App
 
Twitter
Mr. D-O-double R
@lanedorr24
Since everyone started has washing their hands like we’re supposed to, we’ll be working on shapes & colors next week
12:33 PM · Mar 17, 2020 from Beaumont, TX·Twitter for iPhone