Is AUTHOR wrong in the post ? POST : 

Please note I wrote this on a hurry and english is not my mother language, hence the crappy grammar. 
Well her we go:
Lets call her F. She is older than me I think by 6 or 7 years, im 17.

So this started because she insulted and physically tried to assault my mother. 
A couple of years ago my mother's brother, F's father, died by heart attack. F's relationship with her father was not good, she demanded stuff like she deserved them and treated her father (also my uncle) in a very unsentimental manner. 
The night before the funeral my mother had to travel to the city where the burial was going to take place. She had to sleep at my deceased Uncle's house, since she had nowhere to stay. 
F and her sister D were also spending the night at the same house. They were having a hard time. I wouldn't blame them, because they were at grief. However when my mother showed up they threw an attitude at her, they strarted throwing things at her and insulting her for showing up. The words they used to insult my mother are not in my knowledge, nevertheless I know they got physical. 
My anger when I found out they attempted such actions on my mother (who at the time was around 56yo) and nobody was there to defend her, was staggering. F and her younger sister 'D' insulted my mother and tried to hit her by throwing objects at her, such as: cups, shoes, and other small blunt objects. My mom did thankfully find somewhere else to stay. To avoid such conflicts with D and F. 


Nowadays F is living with her boyfriend in italy,  she posts pic's on her insta about the places she visits, and the food she eats etc etc. 
Yesterday I saw one of her pics from her story, I decided I would send her something and I typed 'coglione' for fun, since I was told it meant 'testicles' in Italian. (this was because the foto that she took was from Food that looked like bull testicles) 
I thought she was just going to reply something like "lmao lol" or "haha' whatever. But she went ahead and took it personal, she started asking me If I knew what the word meant.

 I told her: 'it means balls right?'
 
She said: 'no, it means stupid, you should check a dictionary if you are going to say such words in other languages' 

I thought, " jeez it was just a comment why is she taking it so serious? "

I told her, well italian is not that hard to understand (since spanish is my mother language) and 'coglione' really sounds like 'cojones' in spanish, which stands for testicles.

 I did own my mistake and said I did not know that. I told her I was told (by people who know italian) it meant 'balls'. 
 She later said: 'I speak perfect italian, you don't.'

  Yes its true, I did not say otherwise, but I do know she has a braggy attitude and an arrogant way of acting. 
So I told her: 'well italian is not that hard to learn, compared to German (a language im fluent in) italian is way easier for me' (since spanish speaking etc.) I was not trying to brag, I just wanted to tell her I could learn too. 
She later did not respond, but I felt guilty for somehow insulting her someway. I really did not try to insult her, although in the past I did think about confronting her for insulting my mother that night.
I feel a pinch of guilt  on me and I wanted an opinion on the matter. 


Im sorry for the long post, be honest AITA? 