Thanks for reaching out. While there is no direct option to block a channel, the 'Block User' option should help you to do this. Here's how: https://goo.gl/HFPs67 . Once you block a user, they'd not be able to share videos or comment on your videos. Hope this helps.
Dear @TeamYouTube, please tell me how to block some channel completely? So i cant access it anymore?
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Thanks. But i hope there would be new upgrade for this in the future.
End of conversation
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