They're trying to clown you because "zipper merging everyone should do it" but they're not thinking about human nature once again.

It's like communism. If everyone was perfect, leaving enough room and always willing to let people in at the top of the lane without slowing down, then it would work.

But all it takes is one asshole, or even someone that is merely distracted by their kid or something, and the guy in the ending lane has no room and will have to slam on their brakes to stop.

And then they somehow have to merge into decently fast traffic from a dead stop, which is not easy. (Unless of course, the other lane stops to let you in, thus delaying everyone)

The system we do now is shitty, but the alternative if you end up caught stranded is far worse.