First of all: this shouldnt be considered as a cow (and I dont think it is considered as one), because you can exactly the same in #pt. And ropeknocking means just actions that move another worm in horizontal direction.
And I mean there is maybe 1 situation in 100 Elite games (or probably even more) where you can use such a "rope trick", but in most of this cases it wont give you any advantage anyway, because it costs a rope.
After watching the first turns, I'd say that you were just pissed about how you played lol. I mean you just made mistakes and were about to lose this.
Just my opinion, though. ;d