Hide particular airwires/nets in eagle

Yep, and it's pretty straightforward. Just click on the Info button , select the airwire you want to hide, and click on the "Airwires hidden" checkbox. All airwires on that same net will be hidden.

Obviously this is a do-at-your-own-risk. You'll have to remember to explicitly un-hide the airwire later to do the routing.

Simple:

ratsnest ! GND 
(Or ratsnest ! [SignalName])