You owe us everything so stop pretending like you don't.
The point is simply it doesn't make sense. Sieves don't stop things, everything gets through. So at that particulat moment there is no sieve. Taunting needs to be accurate for it to have an impact or have some degree of insult. Not 100%accuracy is needed. I'd be okay with 50% but certainly more than 0% otherwise it is lost and confusing and not insulting at all. Sieving a goalie who makes a stop is 0% accurate and I would think it may build up the goalie because he's showing up the crowd in that case. I guess the argument is it is a bit ironic, but the stupidity of it easily overshadows the irony and there is zero humor at all. Is that why it's done? No one has really explained what is attempting to be accomplished with that chant because I don't see how it would bother anyone, other than confusing them of course.
One example is I remember hearing them chant "better goalie" to an empty net. That was, while not 100% accurate, was at least humorous and was insulting at the same time. Sieving a save accomplishes neither one.