Yes, it would be survivable for humanity. But depending on where it would happen, how dense the impactor is and at what speed it is traveling the effects would nevertheless be quite serious. Imagine NYC or SF taken out like this (of course the chances of that happening are really small given their area relative to the total of the planetary surface):
https://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/201...