In fact, adopting the American style is such a fucking stupid ass thing to do that it makes me want to go kick my boss in the nuts.
Notably, I have now eschewed using quotations marks in my papers and have moved towards using italics if it's really necessary.
Aren't you American? If so, you aren't adopting the American style because in is intrinsically a part of you.
You are rejecting a part of your inner self. You are denying your heritage, right?
(My actual point is, I don't think you can say you don't want to adopt something that is yours already. An American can adopt the British practice of adding the superfluous "u" to color, for example. A Brit couldn't adopt it because they already do it. He could reject it, though.)
It's not "mine"; it's simply wrong. So it shouldn't be done. And you do get to adopt styles, e.g., oxford commas.
Honestly, it's not "wrong" or right;" in this case, it's clearly based on preference. And if your boss prefers it, that's the way you should go, or make a better argument to him/her for why it should be changed.
Your oxford comma statement is misleading -- that isn't some arbitrary "American standard" thing. You were making an argument that the American way of doing X was worse than the British (European? Who's?) way of doing the exact same thing.
It's wrong because it's an incorrect application of what quotations are being used for. It's quite obvious in a situation where a literal string contains punctuation. The argument is trivial; I really can't be held accountable if people don't see it, whether or not they are my boss.
Using or not using the Oxford comma is an arbitrary standard thing. You have to decide whether you want to or not want to use it, and you should be consistent with that decision. Except it's even more arbitrary than the commas and periods inside quotes thing, because there are benefits both for and against Oxford commas, while there is no reason to put punctuation where it doesn't belong.
Notably, there exist American publications that do quotes/punctuation correctly, e.g., O'Reilly's Perl book. Also, Wikipedia does it right, and there is some American journal as well.