To clarify, when you block a channel on YouTube, they'll not be able to watch or comment on your video but you'll still be able to see their content. If you feel a channel is violating our Community Guidelines, you can report it for review here: https://goo.gl/n0WUMW
Thanks for sharing your thoughts. You can file a feedback report with these steps: https://goo.gl/1ckkO5 . While every individual report may not get a direct response, we do review everything and use the details to investigate and fix issues.