Mother wants me to stop Gaming?

As a 20 year old Student doing well in college and doing volunteer work..I'm no loser. Recently, my mother, who is very stressed and angry, demanded that I quit gaming alltogether. Reason being, my younger brother who is in middle school is struggling in his classes, and she believes that it's all my fault because he too, plays video games. He has grounded him countless times, and as a result, she has applied the same restrictions on me. Sure, he may look up to me, and do what I do, but I believe that it is unfair to have her take away one of my entertainment mediums like I am some kind of child. Her parenting style is very much like the "Tiger Mom" so it is very difficult to reason with her without getting yelled at or being punished further. My point in all this, is I simply cannot quit gaming. I'm not addicted, as I only play 3-4 days a week. I want her to be able to rethink her decision, as well as her thoughts on gaming. I want her to understand that it is part of our generation, and such is unavoidable in the digital age. I know I am among many young people who are put in this kind of 'spot' or position by a parent or parents. So I ask now, what do I need to tell her to make her understand?