True, I'm a bit harsh on this, but I also used the word usually instead of always on purpose. Yes, sometimes someone can really get blocked and not able to work, no problem to ask for help in this case. On the other hand I have seen it enough times that people (especially juniors and bosses) continuously ask question without having bothered to think about it prior. Forcing them to deal with a problem by themselves for a bit and not distract others has resolved many of them.

The key thing is being clear what communication and team culture you want to establish. I'm not just a grumpy guy that ignores messages or avoid helping others. It is something that has been discussed and agreed upon in the company and is expected to be respected by anyone no matter where the person is in the hierarchy.