Various languages have various features to make multi threading/concurrent programming easier. Without knowing what language the green text is fanboying for instead of Java it's hard to know what their specific gripe is. Supporting true multi threading out of the box has always been a priority of Java so I don't know what they're complaining about. Generally languages that people praise over Java like Python and JavaScript do not feature true multi threading. (Although Python is getting closer or there now that the GIL is optional.)