Good Will Hunting Not Realistic?

Every Wednesday I help out at Joshua Station's (transitional housing center) youth group for the high school residents. Last night we watched Good Will Hunting and after the movie was over, the leader, Ben, asked everybody what they thought. Karen, a more reserved, incredibly sweet 17 year old hispanic girl replied "I dunno.. it just didn't seem real." Ben, being a little confused turned to her and asked "Why do you say that?" And very quickly, and said as if we should've known, Karen snapped back, "Because he was white!!" ... it was hilarious. That is all.