Not everybody texts the same way. You expecting him to carry a full conversation may not be okay with him because one, h could be occupied. You don't know what he's doing throughout he day. Or he may not know you want to sit or lay around and just text for 30 minutes to an hour. He can't know what you want.
And frankly, I think texting is a very petty and poor form of communication, because you have misunderstandings, and you can't truly understand each other's tone, body language, etc. For example, he assumed you were a bit off. What had him thinking that? Was it certain words you typed? Was a certain time of the day where you didn't respond or did, but seemed short with him? Who knows?