Bennett was frustrated with the all the tap in the show. He drove the ladies doing "Who's That Woman?" crazy too and finally removed ALL their tap shoes. All the tap sounds in "Who's That Woman?" came from the chorus girls and boys offstage. Bennett was not very nice to the ladies on the way to that solution, but the number ended up being one of the best-staged ever in musical-theater history.
All of Bennett's quotes are like that in Sondheim & Co. He was a very hot-tempered man and he used exclamatory language: I HATED it...it was the most FABULOUS thing...that's what he was like. Zadan also has him saying things like:
"It's really no secret that I did not like the book to Follies...I never believed that the show would be successful."
Well, yes he DID, actually.
"And I think that 80 perfect of Follies was the greatest musical ever done....The concept and the musical numbers could not support the show...the musical numbers were more successful than the show. To tell the truth, I could not talk about Follies for a year after it opened, I was so bitter about its failure. So much of that show was better than anything else I've ever seen or anything I've ever done."
By the time I met him 10 years later and mentioned my teenage adulation of the show, Chorus Line was well-established and the bitterness about Follies was gone. Or at least, he showed less of it to me than he did to Craig Zadan when that book was first compiled in 1974.
The swings around the poles Gene Nelson ended up doing did exactly what Bennett was looking when he wanted the tapping to express Buddy's frustration and anger. In the end, all those weeks of the two of them rehearsing in private paid off.
And then Michael said unkind things to Craig Zadan. But that was Michael. As long as the number got a HUGE applause, it didn't matter what you went through to get it.