Playing devil's advocate here: maybe they were trying to be inclusive by not specifiying gender but haven't heard of they. The US education system is a joke in a lot of places so the (hypothetical) teacher may have to think twice before suggesting they change the it's to their. But hey, at least the apostrophe is where it should be and I'd take that as a win for education.

If I had to guess, the meme was probably made by someone who likely has English as a secondary language. I doubt there was any disrespect intended.