Are you aware how selfish this is?
You have decided what mental, emotional and time capacity someone else has available to them and that this resource should be spent on keeping you happy rather than anything else.
For example, most people won’t know, that this week I’ve been working 14 hour days doing a very socially and emotionally draining job, I have two kids in emotional turmoil who I’m speaking to or messaging daily, family all over the world who are struggling and I’m messaging at all hours, a husband and a father who are seriously or terminally ill. On top of that I need to try and sleep, keep up with housework etc. If someone messages me to say ‘Hi’ ‘Did you see the film we talked about’ ‘What are you up to this weekend’ etc That’s not my priority and I don’t have the time or energy right now to respond to that. Explaining that I have a lot on and can’t chat invites further responses which again I don’t have time or energy to do. Most weeks are like this for me, because that is my life and very few people know every bit of the jigsaw because they don’t need to, most of the demands on me are about other people and it’s not my place to share this.
But regardless of any of this, not everyone wants to communicate in the same way that you do, that’s not rude, it’s a personal choice.
The rude people in this situation are the ones demanding a response on their own terms rather than understanding that the world is bigger than their own experience.