Bdtyk

What you are describing sounds like vicarious embarrassment. Apparently, like Schadenfreude (German, meaning satisfaction or pleasure felt at someone else's misfortune), it has no English equivalent.

Here is a summary article, 14 More Wonderful Words With No English Equivalent from the site Mental Floss, that give a couple of words that can be borrowed (just like schadenfreude):

German: Fremdschämen

Finnish: Myötähäpeä

both described this way:

The kindler, gentler cousins of Schadenfreude, both these words mean something akin to "vicarious embarrassment.” Or, in other words, that-feeling-you-get-when-you-watch-Meet the Parents.

Mortified

to subject to severe and vexing embarrassment

Ref: http://www.merriam-webster.com/dictionary/mortify

I would say, "I am repulsed by what I just witnessed."

The Macmillan Dictionary has two definitions for repulsion, both of which could be how your examples make you feel:

1) a strong feeling of disliking someone or something that is so unpleasant that you feel slightly sick when you see them or think about them

2) physics an electrical or magnetic force that makes things move away from each other

The word cringe might be useful here. It is to have a physical reaction to something that triggers your senses in a disruptive way. It doesn't necessarily mean you are revolted by it or think it intrinsically malicious or morally bad. But unlike just saying you are "embarrassed" it points the source of the reaction as coming from something outside yourself.

You could also describe the material itself as being cringeworthy (oxforddictionaries.com lists it as a single-word.)

I would call it Suffering.

Suffering broadly may be categorized as physical or psychological, aka mental. It may come in all degrees of intensity, from mild to intolerable. Low-magnitude suffering may be called discomfort, whereas high-magnitude suffering is called agony.

Dismay maybe?--it CAN be gut-sinking. Or if you want an intellectualized neologism I'm firing up quasisapientphobia for you!... =]

Alienation might work too...

-TRIGGERED-
From a future stance to your question, it's sounds like you were "triggered." Maybe certain events that you witness would be, to you, considered socially unacceptable, and can cause you stress
Emotional stress can cause physical pain. And, hypothetically, bottling up your unhappiness could be enough to cause this stress when you hear people joking about something or having a good time
As far as the mannerisms doing this, that's some DEEP psychological attachments. Subconsciously you could have certain actions linked to certain emotions, linked to physical responses.
I wouldn't say suffering or revolted because they seem too broad to define what your after. Especially with the amount of detail you give. "Cringe" was probably closest to the action, but I would say you were triggered or repulsed Another word to look at is Psychalgia.