Is AUTHOR wrong in the post ? POST : I was in the store on the phone with a friend, we were practicing Spanish ( language is a requirement it our major and we refuse to take another year of Spanish since we took it in middle and high). 

I got into one lane and noticed a lady climbing on the shelf to get something and immediately went up to her. I pointed to the thing she wanted and said quiere (want in spanish), she took some time but agreed. It is very obvious that I don't normally speak Spanish because my pronunciation sucks so I wasn't surprised she just spoke in English. She asked if I could help with a bit more things. She was  pretty and I wasnt completely in a rush but I didn't have the patience considering I was still on the phone and just wanted to get home so I refused.

The lady was unhappy and asked questions/ gave reasoning why I should agree. At first she wasnt rude just pleading to my niceness? (I dont what you would call it) but I said no and explained in very simple Dora/Diego type Spanish that I need to go. The lady got annoyed at my unnecessary Spanish and asked if I can just speak English. My friend is pretty anal about Spanish only during these calls and I didn't want to deal with the backlash so I refused. I repeated the I got to go thing in Spanish, apologized and walked away. 

The interaction only lasted max 5 mins but based on how she was reaching for things, I am a bit worried. I wasn't completely busy and she could hurt herself/ products. On the other hand stools exists for a reason.

Extra AITA: Part of me thinks I care more about this because of her appearance. Would I be TA if that was the case? 