You've given us a few paragraphs about the situation. No one here can tell you if he was attempting to disrespect you.
I'll note that you've called this person a friend in your post, so it's likely you know them pretty well. Instead of asking strangers on the internet with only a very reduced understanding of your relationship dynamic and past conversations, why not have a chat with your friend and ask them directly?
If you're considering this person as your cofounder, you're going to need a strong communication foundation. Getting offended by a perceived lack of respect (which could be valid, but it doesn't sound like you're sure they meant offence since you're asking the question here) is not a good place to start any business relationship.
I'll note that you've called this person a friend in your post, so it's likely you know them pretty well. Instead of asking strangers on the internet with only a very reduced understanding of your relationship dynamic and past conversations, why not have a chat with your friend and ask them directly?
If you're considering this person as your cofounder, you're going to need a strong communication foundation. Getting offended by a perceived lack of respect (which could be valid, but it doesn't sound like you're sure they meant offence since you're asking the question here) is not a good place to start any business relationship.