You wont go out because you worry about him being snarky when you come home? So you're basically allowing him to control seemingly all of your life.

Apparently he has no desire to change and won't do it.

Does he play his video games online? as in using the internet to play with others ? Or does he just plays them on his own with a disc. If he has to have internet to sit himself down and do nothing but these games, cut off your internet service. Will he be angry? Yup. So what... your allowing him to sit and do all the gaming.

I do agree with everyone else that recomends you getting out on your own , Meet ups , book clubs, Maybe a cooking class for yourself or there is the painting and wine places. There are alot of things you can get out and do, Just try one thing, If he doesn't like it , Oh well . Maybe if your start having an active social life he "might" sit up and take notice.

You and only you can make changes in your life. I also agree you should see a Therapist to learn how to manage living with such a selfish lazy man.

Good wishes