History, and tradition, are always a little muddier than one likes, with our propensity to modern, scientific "cleanliness". And it should be that way. Tradition is broader than our way of thinking, and she, like the Church, offer us balance.
The explanation for the omission of the genuflection as a symbol of the mockery from the Jєωs dates back to the great Frankish liturgical commentator Amalarius of Metz (d. 850), in
De Ecclesiasticis officiis IV.1.13. It is repeated throughout the High Middle Ages by many of the great liturgical commentators of that period: Sicardo of Cremona (
Mitrales, VI), Jean d'Avranches (in
Liber de Officiis Eccl.), Jean Beleth (
Rationale Divinorum Officiorum 98), etc. I believe Durandus also makes the same commentary although I don't have a citation on hand.
Amalarius: Per omnes orationes genuflexionem facimus, ut per hunc habitum corporis, mentis humilitatem ostendamus excepto quando oramus pro perfidis Judaeis. Illi enim genu flectebant, opus bonum male operabantur, quia illudendo hoc faciebant. Nos ad demonstrandum quod fugere debeamus opera quae simulando fiunt, vitamus genuflexionem in oratione pro Judaeis.
Sicardus: Pro Judaeis vero non flectimus genua, ut vitemus illorum illusionem, quoniam irrisorie sua Deo flectebant.
That being said, each of these commentators note what SeanJohnson noted, that the Gospels plainly say it was the Romans who mocked Our Lord with genuflections: Matt. 27:29, Mark 15:18, John 19:3. They attempt to make several roundabout explanations for why the rubric makes sense when applied to the Jєωs, and sometimes leave the impression that they are not fully convinced of their own commentary!
If one looks at the earliest manuscripts for the Roman Rite, in fact we discover that the omission was not original. The prayer for the Jєωs was treated just as all the other solemn prayers The omission of the genuflexion was introduced in the 9th century, from Frankish influence, although in some places the ancient Roman practice persisted even through the 12th century. There is no consensus on why the omission for the genuflection (as well as
Oremus and
Flectamus) were introduced.
Given that the omission was a later introduction and that it was the Roman soldiers who mocked Our Lord in this way, and since most people here seem fine with the vandalism of changing the liturgy to make it more palatable for our modern tastes, so long as it doesn't pose a "danger to the Faith," it would make sense to move the omission from the prayer for the Jєωs to the prayer for the pagans instead!

So, when do I get my $100?
