[theshrike79]

Or I'm setting boundaries.

Getting a "hello" from your superior with nothing else is akin to "come to my office first thing tomorrow morning" without extra context.

That day is ruined as well as the next one unless the manager is 5000% explicit that it's a good thing.

[rkomorn]

If your way of setting boundaries is to reply to a message with a URL, I consider you a jerk.

It's got nothing to do with your boundaries.