I'm looking for a witty reply?

My sister corrected me on FB about saying "yu" and "hav" instead of "you" and "have"...I want to make a witty remark back to her. I just can't seem to come up with one. I'm looking for something like it's "STUPID" not "JILLIAN" (Jillian is her name). But maybe not as mean. Any answer is helpful!!