Confusion at Chili's

Last night, my mom, sister, my friend Jana, and I went to Chili's prior to a wedding dress/bridesmaid dress appointment. Chili's has a pretty great gluten free menu, and since I used to work there, I'm fairly familiar with a lot of their menu (though it's changed a bit recently).

I ordered tacos with ground beef (yum!), and on the gluten free menu, it said to order without cilantro sour cream. Fine and dandy. This is how the conversation went with our server/bartender (we sat at the bar):

T: So it says to order without the cilantro sour cream. You have plain sour cream, right?
Server: We mix the cilantro into the sour cream.
T: Right, so you have plain sour cream?
S: It's mixed with cilantro.
T: Okay, so do you mix it here, or does it come in mixed?
S: We mix it here.
T: Okay, so you have plain sour cream?
S: We mix it with the cilantro.
T: Right, so I just want a side of plain sour cream.
S: But....
T: Just plain, no cilantro in it.
S: But it says on the menu...
T: Right, no cilantro sour cream. I just want plain sour cream.
S: But...

This conversation continued for a while. I finally convinced her to get me a side of plain sour cream, after assuring her that plain sour cream, with nothing else mixed into it, would not make me sick. I knew that Chili's has plain sour cream. I should have just ordered a side of plain sour cream. I know the server/bartender was trying to help, and make sure I didn't eat anything that I shouldn't, but that was one of those where I just wanted to shake her and say, "Just give me the sour cream!" Entertainingly enough, by the time we got our food, I was so hungry I just wolfed down half my meal without looking at the sour cream, so she must have been even more confused.

The tacos were delicious, though!