I don’t know exactly what the troll you are responding to was getting at, but modern C++ generally agrees with them that OO isn’t the best way to do most things. For better and/or for worse, C++ can’t remove features, so classes aren’t going anywhere, but you don’t have to make big OO hierarchies.
While the C++ community is largely moving away from OO, the features added to support OO are still in heavy use. For example, std::function is typically implemented by holding a pointer to a templated subclass of a private abstract base class. There's still inheritance and virtual calls and such going on, and that's just not exposed as part of the API.
