I wonder why it's not a big deal where I live - whether it just doesn't happen to the same extend or such behaviour is more accepted.
I know I wouldn't think twice about it if someone switched lanes and forced me to lightly brake. Having to slam on the brakes would be more noteworthy, but that rarely happens.
I live and drive in the U.S. and the perception of what counts as being “cut off” is regional and correlated with density.
A maneuver that’s perfectly acceptable in NYC can earn you an angry honk in the suburbs. For better or worse, in large swaths of the US people are accustomed to having loads of space on the road and ample time to react to changes in traffic patterns.
New Yorkers would call other people lazy/inefficient drivers. Other people call New Yorkers crazy/aggressive drivers. YMMV.
I know I wouldn't think twice about it if someone switched lanes and forced me to lightly brake. Having to slam on the brakes would be more noteworthy, but that rarely happens.