Why is it considered inappropriate to text/call your boss/supervisor even when the matter is work related?

Just wanted your opinions on this.

I worked for someone last year that got really mad when I would text her and I've heard others bring up similar situations.

I would ride the bus to work and one time the bus driver had to kick everyone off because someone peed on the bus.

I called the store first and said I was probably going to be about 15 minutes late. They said no problem. I then texted my boss just giving her a heads up and she replied with "you need to call the store so they can let me know, don't bother me with this" and she would chew me out when I eventually got there and go back to being normal almost immediately. I would ask her why I can't text her just to let her know, and she told me I should know why it's inappropriate and walked away. To this day I have no clue.

I saw someone else text their boss a night before to tell her she needs to call out and that she will call the attendance Hotline in the morning. She was written up for inappropriate conduct.

Why is this a thing?

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