Technical work tends to be collaborative and non-zero sum. Business work, especially on the deal-making, negotiating front (sales, M&A, investing) tends to be competitive, Darwinian, zero-sum. If you win, it means somebody else has to lose.

Humans naturally have both empathetic and competitive instincts. As one anthropologist put it, life is about "getting ahead and getting along."

Business is more on the "getting ahead" end of things, where too much empathy and collaborative spirit can be a liability (unlike say, programming, where it is essential).

So coarse language helps dehumanize others just enough that you feel okay being brutally competitive. We do have to deliberately do this. We are not naturally wired to be cruel and heartless (except for true, clinical psychopaths). Lady Macbeth had some great lines about this, as she prepares herself for the planned murder of Duncan.

The raven himself is hoarse

That croaks the fatal entrance of Duncan

Under my battlements. Come, you spirits

That tend on mortal thoughts, unsex me here,

And fill me from the crown to the toe top-full

Of direst cruelty. Make thick my blood,

Stop up th’access and passage to remorse,

That no compunctious visitings of nature

Shake my fell purpose, nor keep peace between

Th’ effect and it. Come to my woman’s breasts,

And take my milk for gall, you murd’ring ministers,

Wherever in your sightless substances

You wait on nature’s mischief. Come, thick night,

And pall thee in the dunnest smoke of hell,

That my keen knife see not the wound it makes,

Nor heaven peep through the blanket of the dark,

To cry ‘Hold, hold!’

Macbeth, Act 1, Scene V