I agree. Thinking more about it, if you look at the board it shows hand written, a typo count. Which may indicate it is a typing class. Thereby they would be possibly teaching professional typing for a work environment.

So telling users not to talk about pop culture, use slang, emojis, and memes would make sense in that environment.

I personally prefer to use some, but knowing how not to and "knowing your audience" would depict when it is or is not appropriate. So teaching students to say type a professional email/cover letter/resume/response would make sense to ban such. 🤷 <Devils advocate I suppose. Sorry, been a rough week