Scotland would do well to avoid any complacency, as the levels of immigration are proportionally less than other areas of the UK and we simply don't how attitudes would be should that situation alter dramatically in times to come.
As such, whilst levels of overt racism may unfortunately be much more evident in England, I have no doubt that the so far individual cases up here could easily develop into something much worse should the societal mix alter significantly.
As for a fragmented society, that has been a global pattern over centuries. Resident populations are wary and fearful of incomers, and the latter often form 'societies' in geographic areas based on ethnic, cultural and religious background. New York is a good example of how the 'melting pot' theory takes a long time to achieve.
Tolerance itself won't achieve integration and harmony, it must be accompanied by economic opportunity, educational attainment and fairness for all. But that also requires immigrants to participate fully and for the uniform application of the rule of law.
Britain is failing dismally on this critique. At one end of the spectrum we have right-wing hatred straight from the 1930's masquerading as Government policy, and at the other a failure to root out hatred-inspiring crimes like grooming gangs.