I think you're referring to OOP in the literal, "program uses objects so it's object-oriented" sense, whereas parent is referring (more accurately, IMO) to the common, "classical" understanding of OOP as implemented in Java/Python/Ruby. When people say OOP, that is what they are referring to, and in that sense parent is correct, JavaScript is not really OOP. And in the broader JS community, heavy use of OOP is very uncommon.