I understand in the grand scheme of things that spelling errors are not a big deal. I make spelling errors all the time. Especially now that my keyboard is showing it's age. My "o" key is getting wonky, so now I often doouble it or drp it all together.
In fact, when I make a meme, I would say half the time I make a typo and have to redo it.
In a conversation, a spelling error is not a big deal. But memes are shared hundreds, thousands, or even millions of times. Any spelling error will be magnified. And if you have time to make a meme, you have time to spell-check a meme.