I personally, and I acknowledge you might see it very differently, find hiding true, genuine emotions to be manipulative
I take issue with this. It's none of your business to know what emotions I'm feeling. I'm not "manipulating" you by doing so. Depriving you of intimate knowledge of myself? Sure, but that's my call. I'm not twisting or manipulating you or anyone else.
I find it ridiculous that just because you were manipulative and had under-handed motives for hiding your emotion (which you keep using to frame your statement) that you now project that ulterior motive unto others.
Well, I think that feeling something and being inclined to show it (e.g. be moved to tears) only to go out of your way to pretend you're
not so inclined or so moved is indeed manipulative. That person is deliberately presenting to others a falsity in order to influence the social interaction so it corresponds more to how they want it to go.
My "underhanded motives" were the young child's instinct for selfish, the-world-revolves-around-me thinking, manipulating adults. As I became older, I became ashamed and, well, grew up. The instinct to hide emotion and remain "opaque" never leaves us, however (we are all still selfish to some degree, that can't be helped). However, I personally cannot afford to let myself fall back into my childish ways of control, stoicism and refusal to reveal my true feelings.
I'm certainly not saying "people who aren't openly emotional are hostile or out to get me", I'm simply saying that, whether it is with malice or not (and 95% of the time, it's "not"), concealing emotion is manipulative. Given the way I am and how I work, I personally cannot afford to be manipulative.
When I'm actually with people in the flesh, I can usually pick up their genuine emotions anyway. I've always been able to "get" other people's emotions when interacting face-to-face with them. When they insist on presenting falsehood to me while broadcasting the truth below it, I find it a bit rude, to be honest. So many people try to hide it and fail. I had many so-called friends as a child who were convinced they were easily manipulating me. They weren't. I knew exactly what they were doing, what they were truly feeling in relation to me. But, being the shy, friendly, quiet, desperate-to-make-friends boy I was, I simply kept quiet. Let them think I was naive and unaware of the truth. So, both I and they were being manipulative. Relationships cannot be built on such a foundation if they are to be productive.
Edit: Basically, take a young child (3 years or so) who understands and picks up the emotions of those around him, but knows also how to control and hide his own feelings from them. Not good. I was never malicious- I was always compassionate and kind- but I was very, very manipulative. Fortunately,
because I was never malicious no lasting harm was ever done. However, I cannot afford to be that manipulative again. Since my "awakening" at age 11, and the changes that took place which made me continuously "open" to the world rather than sheltered or closed off, I'm (happily) not sure I ever could be, but I'm still not comfortable with the degree of (attempted) concealment other people tend to demonstrate. I understand most people were far less aware of other's emotions and far more open with their own as children. Their path to maturity is likely very different from mine, but these personal prejudices are hard to overcome.