I simply add "0.0.0.0 youtube.com" to the (network wide) hosts file on my router. Problem solved. I'm simply do understand why the problem is just with "shorts", most of the "longs" are not worth wasting time with either. :-)
You can also block any arbitrary page element and that block will persist between page loads. I think it’s in right click menu. I used this to permanently block the YouTube chat feature.