I derive a small amount of pleasure from clicking the little x every few days. I have no idea if it does anything, and I imagine at some point they'll just decide I've accepted anyway but I have no intention of agreeing willingly. I like to think that somewhere in Facebook's offices there's a dashboard that shows acceptance rate and I'm doing my part to keep that small % of resistance alive.
I also stopped sharing my contacts with whatsapp around the time the whole fiasco started.