LOLOLOLOL.
Take a look at how quickly Sidious swings his lightsaber at Yoda and Mace Windu in their duels.
Now imagine a rainstorm.
Imagine Palpatine twirling his lightsaber at comparable speeds to deflect raindrops.
Would he have come out of it completely dry?
Of course not; he'd be soaking wet, because he isn't close to being fast enough.
Bane is literally orders of magnitude faster than Darth Sidious with a blade. He chops him up before he can even react.