Loid doesn't think Yor is odd because as far as he knows she supported herself and her brother by doing sex work at a young age of course she knows how to throw a punch and kick a man through a wall. That's why he never clocks her freaky strength or judges what he believes is her past. He knows that it's tough out there and that you gotta do what you gotta do to survive.
Yuri's weird possessive obsession with Yor makes sense when you realize that as far as he knows she supported them both as children by going off with creepy old men and coming home bruised and bloody. He thinks she was forced to become a sex worker because he wasn't strong enough to protect her. That's why he gets so weird whenever he thinks about her and Loid getting intimate and why in the beginning he feels like he needs to control her love life by setting her up with guys (that he's fully vetted and can easily blackmail if needed). To him, Loid is just the latest in a long line of creeps that he can't protect his sister from.
Meanwhile, Yor, bless her dumb jock heart, has no idea that people are making these assumptions about her and genuinely thinks that she is getting good grades in being a normal woman, a goal that is both possible to achieve and normal to want.
