How do I bulk delete incompatible apps in iOS 11
As far as I know, there's no button to simply "Delete all 32-bit apps", but you can delete large numbers of apps quite quickly using iTunes.

This won't work with the latest versions of iTunes (12.7+), so if you've updated you will need to download an older version.


Select your device next to the media type selection menu near the top of the screen.
Go to the Apps section.
For each app you would like to remove, click the X on its icon or find it in the list and click Remove. (iTunes won't show you which are incompatible there, but you can cross-reference with the list on your device and knock them out in a relatively speedy way.)
When you've finished, click the Apply button at the bottom right.