You sound hostile. Her first
text is like "woah k buddy relax. I call everyone including my dog, sweetheart lol" then you double down on your hostility with "I'm not your dog" so she's like ight this guy clearly has issues. Goodbye."
Playful. Like it's gotta flow. Like in response to her
"Hey sweetheart how are you"
I'd be like, "better now that your texting me *blushing emoji*
Eliciting an awww response. Because I recognize that's where she's at right now. I'm flowing with her vibe ("bro but isn't that beta???" Listen to guys who get laid VS internet alpha males who worship Rollo) VS going in /\/\/\/\/\.
And it's not hate lol. You've stated numerous times you have autism, brother.