Sorry, I didn't intend for my comment to be rude. I was trying to mean "fuck up" in a casual rather than aggressive meaning though I can see why it comes off differently. I.e. it was supposed to be a slightly less child friendly variant of "screw up" and more akin to the (basically nonexistant) rudeness of something like "wtf".

Fair enough that they take turns, I didn't think of that. Still, it would probably be smart to change this though they both are probably aware of this.

Yep.