You can choose to answer the call or not

.. and either way, my concentration is broken for (what researchers keep saying is) 30+ minutes.

Nah. I'm not in the mood to speak to THAT asshole after he wrecked my morning.

In the middle of a text chat, you say "call me and share your screen" and then we 'go voice'. Calling without warning, now, and without justification (visible flames or blood, timely health risks, massive outages), is like dropping by your cousin's house out of the blue for a week.