Question: I have the following scenario where a person I'm working with is new in the team and they're in a leadership role within the team. 

They asked why something was done a particular way. 

I gave them the reasons. They scoffed at it. 

This behaviour is becoming a pattern, and comes across as a little bit elitist instead of engaging and showing vision. I need to develop a constructive way to respond. 

My question is: **How do you respond when someone scoffs at your reasoned answer to their question?**

Answer: 
Always *politely listen,* making very sure that the person knows that you are listening attentively. Ask for clarification of the reaction if it seems appropriate. Remember(!) that the person with whom you are dealing might not realize(!!) how his/her reactions are being interpreted – by you or by others.

If you sincerely feel that this is becoming an impediment, or that the project is going in the wrong directions because your input is being (inadvertently? unintentionally?) excluded, discuss the matter with your manager – and, in their office, *listen* more than you speak.
I suggest just be direct. 

> 
> You asked and I answered. Do you need anything else from me?
> 
> 
> 

You are not confronting them (in my opinion). If they find your explanation unacceptable it is up to them to follow up. Don't complain or argue with them. If you say do you not agree they may take that as confrontational.