I feel like this is why the communication medium matters so much to how things are perceived. There is like this extra layer nuance and detail that is critical in email/chat and must be accounted for. Like the "Thanks!" thing. It's darn near impossible to hear the tone of someone's voice in email. So for me, the "Thanks!" ending kinda defaults to sounding like "Ha ha! It's your problem now!" in my head. Which may, or may not be completely wrong.