And that's perfectly reasonable. As a coping strategy, if you are under stress, I would say you have to protect yourself. It's really hard to explain that to non-autistics, sometimes. I am a good communicator technically, and they end up thinking I am just making excuses for being rude, when I feel the way you mentioned. I think my capability means they believe I always know what it comes across like. Being high functioning can mean they don't really comprehend that you look at things differently.
But in a written context I think, although we may still make some errors due to our condition, in this format we come across far more truly as ourselves, and personal attitudes that are not the autism, but just being, frankly, a jerk, do reveal themselves.
I know, I have been at times....I was immensely tactless a while back to someone on here I was trying to help. that wasn't aspergers, just f***ing stupid 
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Tend to be blunt, tend to put my foot in my mouth, I am probably the smartest idiot you'll ever meet. And a bit of a cynic.
But I care. A lot.
(My username is "tongue in cheek" BTW)