When talking with people through instant messenger or texting, I find it rude when someone doesn't reply. The other day I had met up with someone I knew from school. He told me about a business idea he had, and expressed interest in working with me. The next day I messaged him about it and he ignored me (even though I got the read receipt). A day later I messaged "aren't you going to reply?" and he basically gave some short answer that I'm pretty sure was intended to be dismissive.
How can I set boundaries to let people know I expect a reply, even if it's something like "I don't feel like doing this anymore"? Or is this just the reality when it comes to instant messaging etiquette? I know some individuals who do this more than others (i.e., it's a habit) and that is the focus of this question.
I agree sometimes a day is not long enough, and that read receipts may not have had time to reply. However, the question I asked was very straightforward (what is the name of the website?) and this same individual has done things like this before. Perhaps a better example is my friend was going to an event that I was going to as well, and when I asked him what time he would be arriving, he ignored me. Even replying "not sure" I would find more polite.