The way I see it, you can't filter out haters in life. If you can't handle the little kids with iPods bored at home then you won't be able to handle real hate and criticism if your channel were to ever lead to more possibilities outside of youtube. You've just got to bite the bullet and take the hate to make you stronger. Blocking the comments is not fair to those who love you and got you where you are. It makes me so mad when Youtubers will scroll right past all the praise and genuine comments people leave them, but stop and respond to a hater. Let it alone and let your "fans" (FAMILY) defend you. If things get out of hand on one particular comment then block or spam it whatever. Most of the time if you and your subscribers ignore the person nothing will even happen. They need to feed off reaction so just ignoring them would save a lot of trouble. Just my opinion of course.