I've never had a person actually get upset with me because I've not responded back to a text immediately. I have some people who will always respond to my text

I've never had a person actually get upset with me because I've not responded back to a text immediately. I have some people who will always respond to my texts immediately, and some people who I will be lucky if I hear back in an hour. I don't hold any ill will towards the second group of people. I come to expect that from them. The only time I might get agitated is if someone always responds immediately and then stops, just because it's violating my expectations. I wonder if this person were to stop compulsively responding to texts immediately if people would stop getting angry when he doesn't.