I got into a youtube argument in a video's comment section? is this person being stupid?

I wouldn't worry about this. This person is obviously more worried about racism then the depth of your original point. You tried to explain yourself throughout the arguement and the person rants about racism in each of her posts. You seem to be a well educated, intelligent person who thinks logically. It's hard for a person like you to argue with a seemingly illadvised, unlogical person like that.. Dont worry bout it kiddo.. :)