Earlier quoted context omitted.
>But managers don't care (and many co-workers also). i bet 99% of time people are interrupting themselves. Like i just did to browse HN.
A momentary distraction like a quick HN check is not the same as the context switching of, for example, going to a budget meeting while in the middle of trying to figure out some technical detail. Very different things.
If you could control when the budget meeting happens, or if you could decline it, you'd have far fewer issues with it.