Im 27, i have spent seven years in prison. I have been free for one year.

I have tattoos on my fingers, forearms, back, chest, neck, and on one cheek. I realize i look scary to people who havent been in prison. 

Ive been dating a girl for four months. She knows my history and its generally been good.

However her family does not like me, and judges me on my appearance and my sentence. I have served my time.

Her brother recently asked me if I killed anyone. They also joke that i look like the bad guy from cape fear. 

I told him to not to be a smart ass, and that he should watch how he speaks to other men who might not be as understanding as me.

My gf is now angry at me for "threatening" her brother. I dont make threats, I give warnings. Her family has been disrespectful for months and this is the first time i warned them. AITA.