Of course, I don’t know the exact reasons for the post’s removal, but that is getting quite personal when stating that someone should ‘have the sense to resign on their own.’ If I heard a customer say this at my own workplace, I would certainly find it offensive too.
In my opinion, the line is more blurred with a meme than with plain text and a direct ‘punchline.’ For example, a meme remark like ‘how do you think it went?’ would surely not have been removed, even though the message there is also mocking.