Yes, I'm accused of being abrupt all the time. Especially when I'm busy working on something. Unlike most people, I can't work on something and carry a decent conversation at the same time. I have to drop everything to talk to them, or else my conversations go like:
Them: "Hey, what's up?"
Me: "Hmmph."
Them: What are you working on?"
Me: "The....this..website.. search function."
Them: "Uhh..cool, how's it coming along?"
Me: "Dunnoworkingonitnow."
Them: "GEEEEEZ why are you so rude, I was just trying to keep you company!"
I'm not consciously trying to be rude (usually), I just can't juggle work and talking at the same time.