The way he talked, of course, is exactly what he should have done too
I don't really know the details about the "double X" thing, or the arguments on the Groupfighting server, and to be honest I don't really care about it. But an admin has to be, rightful, of course, but respectful too, to show he's good at his job. Here, the admin used words such as "You little kid", "You French crying kid" etc, which doesn't show a great maturity from the admin of the server. Plus, the word "French" seems to be used as an insult here, which is, in a certain way, racist, and not tolerated on any server, more even coming from an admin.
Do what you want with this admin and this argument, as I said, that's not my business. Just, if I see again one of the members of the 7e Hussards (here, Peponi) being treated like that, by an admin or not, things will not go well.
Be respectful, you'll be respected.