Half of us wouldn't react at all... ;)
Some would think they'd been left behind. Some would cheer the easing of the population crisis. Some would say It was only a matter of time before a pandemic caused it.
Pretty sure I'd volunteer... Someone else probably has plans where as I'm just coasting
Oh, the paperwork that would cause... Easy to snap your fingers, but is he going to help fill out all the forms? Lazy purple good-for-nothing.
Hm, probably the first thing that would happen is that insurance companies would classify it an "Act of God", terrorist attack, or act of war to avoid paying out (depending on policy wording) -- forming a new record for "fastest paperwork filed by an insurance company".
Then next, that's a lot of people gone with no will. Estate law is going to be a mess, and we've got half the lawyers to deal with it. That is going to be a proper mess to untangle. If alive, I'll start a business process outsourcing company to pre-process the paperwork in Vietnam, assuming the Internet hold up.
Is a thanos snap a kind of cookie?
