The management of my company wants people to be positive all the time.
Don't complain, don't call out mistakes, don't criticise, be constructive.
In general this is OK, but I am being asked to discuss a project which almost failed because another team just wanted to block it: they were not in control, they would not help build the project, and they made excuses not to do anything. They stalled our project for six months saying they were working on something identical and confidential, but nothing was being done, they just wanted to stop us.
It's been a very negative experience. I am being asked about it. If I say "we were stalled" or "they were not collaborative" I will get a negative reaction.
But I don't know how to positively, constructively describe a situation where another colleague or team was hostile or not collaborative.
Question: how to communicate positively and constructively an event which was negative and destructive?
Edit: the most important case is being asked in a public forum/team discussion: "why didn't you collaborate with Team X on this?". If I reply "because they lied to us about doing the same just to stall us" or "they didn't want to collaborate" I will get negative reaction. I don't know how to reply to that.