Indeed.
On the site where I am we have Polish painters, dry liners and plumbers and of course labourers !
I have often wondered if their qualifications are valid (or genuine).
Makes my blood boil to be honest.
I was always taught to sort your own back yard out before moving on. And that when in Rome, you do as the Romans do, as in respect the culture and 'ways' of the natives, maybe not all, but many of these migrant workers come with added 'bravado', which can be rather annoying to say the least.
Ed