Is it okay to have two characters who had an argument to patch things up offscreen, or do readers explicitly need to see how they made up?
None of the two characters in question are the protagonist, and the argument itself has little to no bearing on the plot. It basically served as a means for one of the characters to reveal how they felt about themselves. It wasn't even so much an argument as the two characters discussing something and one of the speaking out of turn because they touched upon a topic very sensitive for that character.
I personally don't think this is something that needs too much attention, as all it takes to resolve the issue is for one character to apologize, and therefore readers can just assume after a while that the characters made amends, but I wanted to hear other people's thoughts on the matter.