If you are a techie, you are forced to yell or silent quit the website, and most of the times I really don't have the time to waste yelling.
I agree. As a user, A/B testing is a horrible practice.
Playing devils advocate here I think it’s actually a good idea that YT are testing this. They need to understand how big of a negative impact this would be if released. If enough users hate this change as you and I suspect then hopefully YT see these results in their tests and revisit their approach.
A/b testing stops the worst user experiences from getting rolled out. Our company did a high profile a/b test that got a lot of negative feedback from users and the whole redesign it got canned because of it.