Believe it or not, I'm the same way or at least I have traditionally been.
My "default setting" has always been to be way, way too concerned about what random, anonymous people (let alone real life people, who I'm even more like this about) feel and think.
A good example would be how I routinely feel an incredible amount of concern and stress when I see someone I vehemently disagree with getting ganged up on on a forum.
A recent example would be Ann in the UVA "rape" case thread. It was very, very difficult for me to read what I felt were overly harsh/rude/aggressive posts toward her from people I very very strongly agreed with. I have this natural "oh no, someone's outnumbered and they probably feel embarrassed" type of reaction. This also extends to when I see a bad comedy skit bombing, or a comedian bombing on stage. I almost cannot bear to see another person be embarrassed. It is extremely difficult for me to watch because I seem to have some sort of over-exaggerated sympathetic response to that sort of thing.
Of course, most people here would not suspect that about me because I make what people consider to be very offensive posts, I think. If you look at my post history though you'll find it's only my worldview and abstract thoughts which are "offensive", and you will find very little in the way of engaging harshly and one on one with another poster directly. I'm sure a lot of people would say "yea, typical coward hater. You can't say the sorts of things you believe to anyone's face, you are only able to have such awful views because you cut yourself off from looking at the personal stories impacted by people who think like you!" but my harsh worldview is actually very new to me. I was as hardcore of a progressive touchy feely type as you could care to find until a few years ago. I'm still processing a lot of recent, very significant changes to my view of the world, and figuring out what (if any) implications those have for how I interact with other people. It comes naturally to me to be deferential and warm to individuals, and I've had a great many close friends who would surprise those who see my views expressed here, in terms of what sort of people they are.
I guess I've just come to believe there are some very unfortunate, inconvenient, and unpleasant realities in our world which cannot be wished away and which, sadly, have very hurtful implications for a lot of people.
But enough about all of that. You seem to believe what I said about the space alien example was offensive.
I'm not sure why. It was merely an attempt at humor, and infusing a bit of randomness and silliness into the post.
I wasn't attempting to imply transgender people are equivalent to space aliens, and I don't have any negative feelings about space aliens anyway.