Two take-aways from this clip from the interview between Elon Musk and BBC reporter James Clayton.

1. It does not matter who has your back, you have to be prepared. You have to know what you are talking about. You have to do your research. You have to have facts. And if you don’t, which is fair, because sometimes there’s just too much to know, just avoid the topic you are not prepared about altogether. Drop it.
2. There’s a point when you are winning an argument where you need to check with the situation and concede something to the part that is losing the argument. If you don’t, you are just going for the kill, and nobody appreciates that.