[Kursk]

Tbh Thunderballs I'd just let it go, it isn't worth the increase in your blood pressure. I'd also apologise; not because there is a demand but because it just isn't nice to be confronted with expletives when you're just doing your job.

Swallow your pride, say sorry and move on. Anything else is just wasting your time. Besides, you have shown your capability here; you don't need foul language to make a point.