Open YouTube and sign in
Go to the channel you want to block
Click the channel name or profile picture
Open the About tab
Click the More options menu
Select Block user
Confirm the block
On a video, click the channel name
Open the channel page
Use the More options menu
Select Block user
Confirm the block
On comments, click the user name or profile picture
Open the user’s channel
Select Block user from the More options menu
Confirm the block
On YouTube mobile, open the channel page
Tap the More options menu
Tap Block user
Confirm the block
To unblock, go to the channel or comment profile again
Open the More options menu
Select Unblock user
Confirm the change