We may settle at calling it "disrespect", but at the bottom of it lies a range of acts of cuckolding because being a husband is more than having exclusive sexual access. That's why it feels disrespectful. 

 Gay or not, you don’t discipline other people’s kids 

 I guess that depends on what you call discipline. If it’s a one off comment when the kid does something terrible, that’s probably fine. But if it’s lecturing about something or more physical, then def not ok. 

Give a ride is probably fine. 

Fixing things up - nah. Why? Let the guy handle it or pay someone. 

 the natural way would be a man on man fight but i guess that's forbidden now