It's so frustrating when my guy friend asks me to hang out a

It's so frustrating when my guy friend asks me to hang out at a certain time and when I'm ready, he says he's in the middle of something and asks me to wait even longer. "Why did you even ask me to hang out at that time then or why would you start doing something that might take a while when you know we'll be hanging out soon??" Am I being unreasonable? Like obviously you knew we were hanging out, so like either tell me a different time or just pause what you're doing for a bit, especially if it's something that will take a while? I mean, I'm not asking him to just be constantly doing nothing and wait for me, but at least, don't make me wait like another half an hour after you said you wanted to hang out at that time. Like if it's like just for 5 or 10 minutes if you're still getting ready or whatnot, that's fine, but like anything more than like 15 minutes and you're in the middle of something, it starts getting annoying, especially if it happens fairly often. Feels like it's disrespectful.