AITA for telling my friend to fuck off with the way he texts?

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The original was posted on /r/AmItheAsshole by /u/WiseIndustry676 on 2023-10-06 20:39:18.

I (22F) hate texting - I only text people once a day. The issue is I have a friend who loves texting and is constantly messaging every second. Many of his friends and family don't mind it and some do. Some people had to have profound words with him over him texting them constantly and he's respected chiefly their wishes and has slowed down with the texts.

For the last six months, he's been sending messages in a way he thinks it's the funniest thing in the world but it annoys the fuck out of me. I think it would do with everyone else, but instead of texting, "Hey, how are you?" he decides to text like this: "H e y h o w a r e y o u ?" and sends the letters all individually.

When he texted the first time, I thought even though I found it annoying, I'd ignore it as he's only done it once, but he continued to send messages like that. After the third time, I asked politely if he could stop sending me messages like that, as it's annoying. He said he would continue to send messages like this on and off. I told him numerous times to stop, and a few times, I've said it's childish, pathetic and stupid to send messages like that, and it's not funny. He has admitted to sending messages like that because he gets a thrill, as he knows it pisses me off.

A year ago, I decided to move from Android to iPhone and finally invested in an excellent iPhone 7 and turned on iMessage. I wonder if effects are the correct terminology, but along with the messages, he would send these effects, mainly one effect: the laser where the laser shows up on a text.

Recently, I had to turn off all messaging notifications like Messenger, Snapshot and WhatsApp because he's constantly sending me messages like this. Not only that, I am a full-time undergraduate student and I need to concentrate on my studies and I have notified him in the past that I am studying and not to message me but he sends the messages like that even with the notifications off.

I finally snapped. I went on messages and found out I had 67 messages from him all individuals. I sent him this exact message:

"Mate

Listen, I get you think that this is hilarious sending individual letter messages but it's not. I think it's pathetic and childish and annoying; after all, you are 22. I have told you so many times to please stop sending me messages like that because it's annoying, and even you said you only do it to get a kick out of annoying me. Not only do you say you're a friend but I have told you in the past I am studying and to please not message me unless it's an emergency and yet within a minute you're responding by sending individual letter messages. Because and only because of you I've turned all my messaging notifications of on any platform I have where I am able to send messages and I think it's childish and pathetic and you should grow up. So fuck off and don't text me unless you're going to text like normal people do."

Reddit, AITA for this and if so/not, why?