This is not the first time I see this here and to be honest, I was in total agreement a few years ago. In principle, I still am.

Then I became a manager, I had to start dealing with more people, to navigate the enterprise environment and I understood that one of my strengths is to be understand people and to accommodate their ways of working. In this context, being hard with people that just say hello just doesn't make much sense to me anymore. People have busy schedules, they start conversations and are interrupted, they receive hundreds of notifications and have other meetings going on.

If the worst they do to me is to say hello and never talk to me again, I'm ok with accommodating this in my daily workflow.