There is a direct path for personal interactions to produce blowback for individual and the organization, as well.
Sony might enjoy the little flash in the pan against Microsoft, but they would probably take note of it as well.
The next time they throw a little temper tantrum for the world to see, they might be angry about something Sony did.
I would recommend being a rock-star in the game industry that is somehow irreplaceable, because what's the likely outcome if a regional manager for Microsoft makes an angry call to Corporate Central otherwise? It's not like there isn't a public record of that employee shooting their mouth off about a partner company.