I don't want to work with sociopaths who can't be kind to a voice on the phone.
Calm down, you're overreacting. A single sentence is hardly "perfect evidence of inability to empathize" with others. Talk about "exaggeration"...
I somewhat agree with lupire: If someone only has empathy with their coworkers – who they're interacting with daily – if they can physically see them, then that's saying something.
Your posts contain one personal attack after the other. Really: please take a step back and relax.
Sociopaths are an outliers and rare. But most people empathize less with people they have not met in person (prof: the internet, even before social media).
Add deadlines and stress to that, and you have otherwise normal people behaving worse than they would otherwise. Source: me, working with remote teams for past 20 years.
Like the person above said, you (or someone) have to be actively on the lookout for such issues, or things can get get bad really fast (I am talking days and weeks not months).