One thing that complicates online discourse is the lack of demographic information. If I see you in person, then I know your age, for example, and that tells me at least some information about your life history and past experience. If you were born in 1980, then it's a safe bet you grew up without a computer in the house. If you were born in 1990, you'll remember when your family got its first computer, but most of your life has been digital. If you were born in 2000, then you almost certainly don't remember how the world worked without relying on computers.
It also tells me something about how to speak to you. If you were born prior to 1980, I'm not going to risk using profanity around you, since there's a good chance you'll take offense if I drop the F-bomb. If you were born after 1980, it's a safe bet that you won't care in the slightest what words I use to describe disappointment or frustration.
Everyone develops stereotypes to help navigate social situations and avoid upsetting the people they're speaking to. In extreme situations, they turn into bias and prejudice for or against certain groups of people, but innocuous stereotypes are as inevitable as death and taxes because our brains use them to reduce cognitive load to get through the struggle that is everyday life.
If you keep in mind what cognitive tools you're using to make life easier, it can help you avoid a
faux pas. For example, I've had more than one friend transition both man to woman and woman to man. At first, I thought implicitly,
You're a guy now? I'll treat you just like one of the boys. That line of logic seriously backfired. People raised as women will be offended if you treat them like men. The set of assumptions I use when interacting with men can't be transferred to apply to trans men, and my assumptions about how women prefer to be treated do not translate to trans women. In those cases, you need to unpack your assumptions, even though it's more work and increases the cognitive load of interacting with that person.
All of that is to say, it takes more work to be courteous online, because you have to plan for every possible way someone can be offended, and in some cases, it's just inevitable that some people will be offended.
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