People tend to treat it as if it was a ‘point’.
A theoretical concept that has been put on a table, studied from all angles, found desirable/unacceptable and which is now aggressively marketed by fervent apostles/rejected by ‘die-heart fundamentalists’.

I’m afraid it should rather be treated as a continuum.

People belonging to diverse cultures who freely decide to live together will, sooner rather than later, generate a meta-culture based mainly on intercultural mutual respect.
People belonging to diverse cultures who have to live together, without previously being asked whether they want this to happen or not, will, later rather than sooner, generate a meta-culture fusing together various cultural segments appropriated from the various cultures that were forced to coexist.
I am fascinated by the fact that both ‘extremes’ can happen simultaneously.
Individuals, usually unaware of what is going on, find ways of cooperating with members belonging to other cultures to impose/reject ‘cultural artifacts’ upon/coming from individuals belonging to other cultures.
The key of all this being a simple matter of ‘perception’.
We find it easier to cooperate with people belonging to cultures which we perceive as  ‘friendly’ and to treat with disdain those belonging to cultures which are different enough to be perceived as inferior. Hence ‘unfriendly’.