What often helps is if you frame it in a way that shows you as the less knowledgeable person, that way people tend to feel less "attacked". For example: "I did

What often helps is if you frame it in a way that shows you as the less knowledgeable person, that way people tend to feel less "attacked". For example: "I didn't understand X, could you explain (again) what you mean by that?" But in the end, I guess the more important thing is to build up enough trust between the teams, that one isn't constantly driving the attack/defense line, but can openly talk about ideas and see questions as clarifying, rather than attacking.