You're correct to say his views are his own and he's entitled to them, but what he did in the dressing room was effectively to say to his foreign work colleagues 'I hate you cunts, you're ruining this country, go home'. I for one would like to say some of that to people I work with but I wouldn't last 5 mintues and nor would many other people.
Unless the story has been misreported then his overall lack of savvy or dimplomacy will hardly be good for team spirit.
It was in the Daily Mail, I reckon that there's at least a 50% chance of this, it will have at least been blown out of proportion.