Acting like I have authority, at the Home Depot

"So, wait, why did you pick a flat?" "Well, personally, I just think glossy paints are cheesy looking." "Oh, right." "But you've got kids, so you probably want some gloss, in order to clean the painted surface." "Uh huh, so I went with eggshell?" "Yep, that sounds like a good choice." "Excuse me, but I'm getting this for my friend and I don't know what exactly she wants. I told the guy flat but he said, since it's for a kids room, I should go with flat enamel?" "I think that's right, not glossy but still cleanable. Your friend won't be able to tell the difference, it's so small." "Ok, great, thanks!"