Maybe, but that's the world we live in now. If it's crazy, it's an inevitable sort of crazy. Get enough spam calls, and even if you know you might get a valid call from an unknown number, you'll find yourself treating them all as spam just the same. We really, really don't do well with repeated false alarms.

It's how our brains operate, and the fact that the spam keeps on coming just reinforces it. If the call is legitimate and time sensitive, you hope they'll leave a voicemail or, better yet, follow up with a text message.