it's youtube. it's not criticism. it's a bunch of butthurt 16 year olds cursing each other out and calling each other "f-a-g-s".
Any band should be able to handle teenagers telling them they "fucking suck, holy shit lol". If Black Flag can't brush that stuff off, I can't them seriously. The fact they censor comments in general is cowardly, especially from a bunch of dudes in their 50's.