I think it all depends on how that person usually responds, both in-person, and in written communication. If they are usually chatty and like to over-explain, a

I think it all depends on how that person usually responds, both in-person, and in written communication. If they are usually chatty and like to over-explain, and sprinkle emojis everywhere, and then, to this one particular message, they respond with just "ok.", then there could be something to it. However, if they are simply terse and serious most of the time anyway, then they are just being themselves. I would be nice if they were chattier, but it's just their usual personality.