You don't have to be special. You just have to have a skillset and knowledge base that's difficult enough to replace that people treat you with a modicum of respect. If the place isn't burning to the ground, I don't think it's unreasonable to push back.

"a skillset and knowledge base that's difficult enough to replace"

That would be the definition of special.

I guess it depends on how low your bar for calling something "special" is. I would put on two different levels someone who truly has a "special" skillset vs. someone who is simply very effective and in whom the company has a sunk investment.

That's in America.

In Europe employees have a bit more to say.

Or don't give your boss your cell phone number?

Don't be an apologist for bad management and bad people skills. If a boss or management ever called me and requested me to do a task on my own time, not company time, I'd politely refuse for obvious reasons. It's okay as a one time thing, "Hey David sorry to bother you at 7 but could you do me a huge favour and do X and Y? My bad I'll buy you lunch tomorrow" then yeah that's fine. But if it's spoken with any hint of authority or consequence they can fuck off.