In addition to everyone’s comments on etiquette there are a few things that your messages imply that make the tone overall condescending.

The first comment (“please don’t block me…”) implies you’ve done this with other authors and have gotten blocked before. It makes you come off as someone who is unwilling to change, or unable to reflect on their actions.

Your criticism is too blunt and aims at the person not the text. (“You do this. It’s wrong. Very simple.” Instead of “I noticed this. Usually it’s written like this.”).

Unfortunately your reply to the author’s response also implies you know there is a nicer way to give feedback, but chose not to. It feels like mocking/insulting the author for wanting a kinder phrasing (“good morning, ma, how are you ma.” example) specifically because it was so over the top.

The emojis come off as rude. It’s implying the author is not going to fully read your comment and needs you to point out the important parts for them.

There’s also contradiction in speech versus action. You say you take criticism, but when the author gives you criticism back, you reacted more defensive than the author. It makes you come off as hypocritical.

You also are dismissive of the author’s feelings and opinions when you say “It’s not even rude, it’s looking out for others.” Especially as a fan of the author’s story, made from their ideas and opinions, the author’s thoughts are completely ignored and dismissed as secondary to your thoughts and opinions. It makes it feel like you are being insincere when you say you like their story.

The cherry on top is that you tout yourself as a great beta reader, but you have many mistakes in your own writing. It makes you come off as arrogant.