It depends on the context and situation. You are right for some random public channel. I am talking about for instance chatrooms where a small remote team joins for the express purpose to collaborate closely, and I often find these weird deviations from how you would behave offline in similar setting to be very detrimental for communication and productivity killers. Part of it is about setting expectations and fostering the 'room culture', and that can help improve things. But there is an overall behavior change to the online world. Comparable perhaps (but different in the details) to "road rage", a general behavior shift people have once they step into a car and are insulated from others by their hotrods window screens. And 'commandeering' never works well, btw.