IMO, an airline reflects the 'attitude' of its homeland. Has anyone ever flown on Olympic airways? Let's just say the customer service attitudes onboard are 'different' from the Asian carriers, in that regard, we, as CX regulars are spoilt.
There are at least two cultures that are fundamentally unsuitable for the service industry - that of the Greek's and Russian's. If I ever have the misfortunate of having to travel on a Greek or Russian airline then I shall apologise to the FA's upon boarding for bothering them.
That said, it often surprises me with CX how 'on' or 'off' a whole FA crew can be. That is, how a positive or negative attitude can seemingly involve more than one of the FA's allocated to a flight. Sometimes it is the foreign born FA allocated to a flight that provides the warmth and good service that seems to inspire others.
I think the ISM and his/her pre-flight prep talk makes quite a significant difference to the performance/attitude of the crew on that particular day.