But there's a big difference between talking and writing/reading. If someone is talking when you are listening the are interfering with you.

The existence of threads you don't want to read is more like the existence of books in a library you don't want to read. Unless they crowd out the books you do want to read, they don't interfere with you.

a way to avoid BS-thread (if they are labeled as such) But they aren't much of the time. I think good more consistent labelling would make things easier for everyone.