I generally recline my seat slightly, but a long way from full position.
I would try and negotiate with anyone who found even this much recline uncomfortable.
But if someone behind me used that thing, before even attempting polite discourse, I'd calmly inform the airline personnel that the passenger behind me was intimidating me.
I'll put up with a lot from my fellow passengers in the name of keeping the peace. But when there's no peace to keep, where's the incentive?
By the way, I've had a DVT and I'm 5'2". So the inventor's inference that I somehow am immune to the problems of cramped space are invalid.