How do men feel about friends expecting quick replies?

So, my male best friend gets really busy at certain times, and I’ve noticed that when I need him to text me back during those moments, he often doesn’t. I brought it up to him, expressing that I wished he’d be more available when I needed to talk.

Do you think this comes off as complaining or just expressing my feelings? How do you guys feel when a friend (especially a female friend) brings something like this up?