Quite the opposite, as an east Malaysian, I always felt west Malaysian look down on us east Malaysian.
Most conversation with them end up sounding like “do you guys still live in trees?” Or “is there clean water etc?” Or “your leaders are so corrupt yet you guys are dumb enough to keep voting them in”

Oh how the wheels have turned

I don’t really know anyone in my circle that works in Brunei so it must be very rare.

Most I know work in SG.

And some of them are also full of themselves when they come back to Malaysia for holidays. So it’s not an east Malaysian thing but more like a personality thing of certain individuals.