AITA for asking to reschedule a hangout the night before?

I had plans with a dude that we had made about 3/4 days ago, and it was nothing major. I was speaking about the fact that I'm going into town to do some shopping, and he suggested I come over to his after and hang out for a bit as he lives right in the town, completely casual and chill may I add. I agreed because why the hell not, it's something to do, and he mentioned that he will be working at some points on his computer as he works from home.

Last night, a day before the hangout, I had some unexpected plans during the day that meant that I wasn't going to be sleeping until late. He messaged me and asked if I'm still coming tomorrow and I jokingly said 'haha if I'm awake in time' he then mentioned that I need to respect his working schedule so I said basically in that case why don't we just hang out on Saturday instead of Friday when he isn't working.

This afternoon he is messaging he seeming rather angry, saying that I was really disrespectful for cancelling because he apparently rescheduled work meetings because he wanted me to come over, which by the way I did not know he had rescheduled meetings. He made it seem to me that he would be doing bits of work while I was there, nothing about rescheduling work meetings. I can understand how if we had booked an activity or to go somewhere, it would be bad of me to cancel the night before, but for me just going to his house for a couple of hours to chill it didn't seem like a major deal to change it to a day later as he kept going on about his work.

He is now saying a range of things and saying because I haven't got a job at the moment I don't understand him (even though I have worked 4 jobs) and he is saying how my other friends don't see it as an issue because they apparently don't work (even though all of my friends do work) and well yeah he is just sending huge paragraphs about how disrespectful I am for suggesting changing the day to Saturday when he isn't working to make it easier for him!

Can I also add I have only met this person once, and we haven't been in contact for a long period of time. It just seems like a huge deal has been made out of this and it has left a sour taste in my mouth. But am I the asshole for this?