One can.
To what extent one can learn it varies from person to person. I'm aware that others have their own thoughts, but I very often forget that how they perceive certain specific things may not be the same as how I perceive them. I am also totally incapable of imagining what they may think if it's different from what I think. I may be aware that others aren't thinking what I'm thinking, but the whole concept of imagining WHAT others are thinking isn't realistic to me.
What are you supposed to do?
The best you can. It's all you can do.
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I'm not likely to be around much longer. As before when I first signed up here years ago, I'm finding that after a long hiatus, and after only a few days back on here, I'm spending way too much time here again already. So I'm requesting my account be locked, banned or whatever. It's just time. Until then, well, I dunno...