Sadly, I've seen stuff just as illiterate on meme captions created here. For some of us, literacy, good grammar, good spelling, and good punctuation is important to us. Good meme. Upvote!
I'm all about good grammar as much as the next guy, but when it comes to memes I don't really care so much...we all make mistakes from time to time and sometimes autocorrect screws us too...but we all also know how easy it is to miss a small mistake, even when you proofread it. As long as the message was still conveyed, I don't see any reason to constantly point it out...that's just me...and thanks btw.
I think for me, it is some sort of involuntary flinch reaction, courtesy of the brass ruler swinging nuns that I had in grammar school. I guess, I tend to duck and cover when I see the errors, whether I caused them or not. Thank you Sister Mary Charles Bronson. :-)