Should I confront him?

An issue I’ve always had with my boyfriend is that he does not reply to my messages when he receives them, and uses Instagram instead. So for instance, I sent him a message at 1:30 and at 1:50 I see him like a mutuals post that was posted at 1:45. That means he was using Instagram and ignoring my message he received a while ago. My message was me stating that I took a nap and had just woken up. It is not extremely important but it still bothers me that he doesn’t reply, especially when I have confronted him about this issue many time before. Am I wrong for being bothered or should I confront him again?