My stepfather is a narcissist, drunk asshole

What major thing I want people to understand is that if you don't know my life and I start explaining certain things about my life and you automatically assume that I don't know what I'm talking about you're allowed to ask questions. 

Let me tell you about my stepfather, he is a narcissistic know-it-all asshole. And I'm saying this as somebody who has lived with him for over 10 years. This man will treat you like your sludge on the bottom of his shoe because he thinks that he's either smarter than you or he thinks you just happen to be dumb about something. 

To point out, this man thinks I'm the dumbest person when it comes to technology, I'm a hacker, or I know everything about computers. He doesn't trust me around computers he doesn't want to trust me, he's never liked me, he doesn't want to like me. If I died tomorrow nothing would change to him. 

I've never been able to get on his good side for too long. We can exist in the same room and not be enemies but when he starts drinking he becomes the biggest asshole you can think of. 

I want people to understand that I don't have any control over how things work with him. I don't know how people expect me to live with a man who constantly puts you down, makes fun of you, uses ad hominin attacks, yells at you, and doesn't let you have a word in edgewise when you're in an argument with him. It's like living with a 7-year-old that drinks. This man is 60 years old. 

I am 34 years old. I do not have control over the situation. There's nothing I can do about it. Do I wish I could live on my own? Hell yeah! But I can't. So for anybody that wants to make fun of me, that wants to be mean and negative to me, go do it to someone else because I'm just going to block you at this point. I'm sick and tired of all the negativity from people who don't understand how my life works because I am so sick of everybody else. 

Good day.