Except for the fact that Qt is not as cross-platform as the standard C++ library. Qt also uses non-C++ features such as signals/slots which require usage of their own Meta Object Compiler.
Do you also tell people that they shouldn't use flex/lex/bison/yacc/antlr/etc.? Why are those code generators/DSLs acceptable but the moc is not? It's not as if the Qt authors added it because they don't understand C++, they added it because it solves a vexing problem in C++ GUI design.
Every Qt "keyword" you talk about can be disabled with a fallback to namespaced macros.
foreach -> Q_FOREACH slots: -> Q_SLOTS
etc.