Earlier today, I was talking to my mother about the remarkable difference in calories between two brands of frozen chicken, as well as the quantity of food you can have with lower consequence if you just choose healthier foods, and she interrupted me to say that she gets the point and I didn't have to list the facts on the package.

I butted back in, saying that she could have at least let me finish the sentence I was in, or politely interrupting with a preposition, instead of bulldozing loudly over my sentence.

Before I could finish, she started screaming "But, But, But, But..." over me because I began my sentence with the word but before calmy re-adressing my sentence because I did not believe that she actually received the message that I was saying.

This angered me, so I started yelling at her saying that she should have been more polite in interrupting me if she was going to barge in during my sentence.

This resulted in a long screaming match, where my mother ended up shouting things like "Adults don't wait for others to speak", "That's not how adults talk, adults get the point and move on", as well as "You were being boring, so there was no point in listening.

Thinking angrily instead of rationally, I decided to storm off before I did something I'd regret (I have a past of punching and throwing things out of anger in a blind rage with little recollection of my thought process).

For context, I'm 19 and visiting home from college for the holidays.

Am I the asshole? Should I have just let her rudely interrupt my "boring point"?

TL;DR: Mother rudely interrupted myself and started a loud argument about adult conversation. 