This is a pickup truck and not a dedicated off-roader. The rear shocks are stiff in order to accommodate loads in the bed and hitch. This is further compromised because trucks have a weight distribution around 60/40.
So yes, going around a high-speed bend and hitting a bump in the road will cause the rear end to kick out 1 to 2 inches. If BMW owners think the rear end kicking out 1 to 2 inches is a big deal, they going to have a bad time.
For the safety of passengers in your vehicle and those around you, please don't react to the rear end kicking out 1 to 2 inches. For performance and handling purposes, that is insignificant and driver inputs only make the situation worse. The raptor is stable and wants to drive straight as long as people let it do its thing.