My GF and I had an argument about “you guys”. Her point was that obviously there isn’t anything…

My GF and I had an argument about "you guys". Her point was that obviously there isn't anything wrong with "you all" (because none of the others are actually "legal" in our dialect). And it's true. But also, the fact that people *empirically* don't like saying "you all" and contract it to "y'all" or shift to "you guys" shows that there's something lexically uncomfortable or too-long about "you…