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No.

It is not reacting to pain but just generating language that looks like reacting to pain.

CS folks need to read more philosophy. You’re describing a philosophical zombie and there is a mountain of existing literature about them.

https://en.m.wikipedia.org/wiki/Philosophical_zombie

Are we really any different?

Yes because natural language is just one way humans have adapted to sensory input.

Do you feel physical pain when someone tells you they're taking points from you? No?

There's no call for analogical reasoning, the literal interpretation of the same action is right there.

If so, why not also worry about the ghosts in pacman?

Because people aren't taking the ghosts from Pac-Man and hooking them up to the internet with read/write access and sometimes-human-level capabilities.

I meant: Worrying about the feelings of those ghosts.