Yeah the mix-up is a mess. I'm Dutch but as a programmer I've used dots for decimals my whole life. We should just get rid of the comma as decimal separator. Or do a worldwide survey for a representative sample and have a majority vote on it.
Then as for thousand separator, I always use spaces when I want to be clear (blog posts, comments), or the standard when I want to be correct (school reports, reports for our client). I've also seen apostrophe being used as unambiguous symbol but people frown at it. A little spacing is a natural way to group, especially on paper you can just write some more snugly than others and it's 100% unambiguous and perfectly legible no matter how many digits.
And while we're at it: yyyy-mm-dd, dd-mm-yyyy, mm/dd/yyyy or dd.mm.yyyy (in order of preference). Anything else is just incorrect imo. It's rare but some Dutch weirdos use our ordering neatly (ddmmyyyy) but then start using slashes, which Americans (with their incorrect though understandable mmddyyyy) typically use, and it's just impossible to disambiguate. Here too, let's have a global majority vote, at least for this calendar system -- but whatever you do, at least don't use different symbols at random.
