Rant or advise me pls ?

Maybe not a rant but more like advice. My partner is upset with me because sometimes the way I say or text things comes off much colder than I mean to (in hindsight, I’m not good at seeing that I do that). They know that I don’t mean things harshly but still lets it upset them. It’s also commonly known that I’m not a particularly nice person but I am kind (I don’t say mean things to people for no reason). I have a pretty neutral personality. I have been pondering this all week while they’ve been gone on vacation because I really cannot see how what I said had any mean intonations and I’m starting to wonder if perhaps we are just too emotionally incompatible? I don’t want to second guess my words all the time nor do I want to hurt them but our sensitivity scales seem far different. I’ve never had a partner respond this negatively to my dialogue and it’s sort of links to just who I am which makes it a difficult change and maybe an unnecessary one. Being a sweetie just isn’t me. What do you all think of this? Is emotional incompatibility a thing? I think I’m not ignorant to rude texts/language so I’m at a loss.