Is OTHER wrong in the post ? POST : (Weird title I know)

I was waiting in the line for a bathroom at an orchestral concert, and women's bathroom lines are always long as fuck so I was there for quite some time. I have a habit of quietly singing under my breath when I'm bored, which is pretty important to the story. Behind me were two older women, 50-60 ish, who were doing the typical older lady thing of being judgmental as fuck. 

Such highlights including:
- pointing out someone's highlights and saying how she looked like a skunk 
- saying someone's shirt looked like a huge stain
- looking at my shoes and calling them dreadful

You get the gist. We were in the queue for about 15 minutes (the whole intermission) and when we were t the front of the queue a smaller lady dashed in to quickly wash her hands. The women behind me noticed this and were quick to start on the 'we were waiting longer and first' etc etc, which is fine- they misunderstood her intentions. 

Then one of them turned to the other and said 'I bet she's Russian, all Russians are terribly rude.' Her friend nodded along and recalled her time in Russia when the first lady finished with, 'Any Eastern European really, rude and dirty.'

Although I speak very little Russian, I am not Russian in the slightest. Nor am I Eastern European in anyway, but to hear someone stereotype like that really got me, so I decided to drop the hammer as such. I pulled up my emergency screenshot of my dad's phonescreen to make it look like I was actually in a call and began to loudly speak the little Russian I know and formed it into what sounded like a conversation ('Hello', 'Good, Thank you.', 'And you?', 'Yes, No', 'Goodbye') or at least something a non-native speaker wouldn't cringe at. After my quick 1 minute phonecall, I hung up and then helped another different old lady with something and spoke to their in English so that they would know that I had understood them. One of them ended up needing to use something before me so I used the Russian form of 'after you' to address her. They were both quite embarrassed and now I feel quite bad. 

AITA?