The jury is out on that one Mex

In my experience regional accents disappear when speaking other languages. A friend of mine here is from Manchester and speaks completely differently from me when we use English - but when we both go into German that difference is neutralized, we just sound like Englishmen speaking German. I've even heard that the Germans can't tell the difference between an Englishman and a Scotsman when they both speak German. Which stands to reason - you and I can tell the difference between a German and a Frenchman when they speak English, but not between a Bavarian and someone from Hamburg (though the difference is all too clear in German). Basically anyone who is bilingual (German and English) can understand about 70% of a text in Dutch, though speaking it is a completely different matter. Also the Dutch language differs markedly between regions so that a person from Frisia or Amsterdam may use English when speaking with a person from Antwerp or Bruges (although Flemish is, technically, Dutch). The Dutch just presume that nobody speaks their language - even Erik Ten Hag (team trainer at Ajax) uses English in the dressing room. Even the fans forums of Ajax are bilingual.