"Laughing is often just the release of tension or suspense. It's why we laugh more when with other people than by ourselves. It's often funnier when we feel like we shouldn't be laughing. Getting the giggles in an inappropriate situation; laughter at a wake is a great example.
The thing I don't understand so would like someone to explain in simple words for me is how you can be offended on behalf of someone else.
Don't get offended by jokes. Get offended by the thing the jokes are being made about."
I have hidden disabilities. I'm not going to discuss them all on this thread, but for example my diabetes is often the punchline of 'jokes' and sneering that does real fucking harm.
I work with a diabetes charity. We see countless cases of children being bullied in the playground, saying they got type 1 diabetes because they were too fat. Which is bullshit.
If you are diabetic, you are much more likely to develop an eating disorder - again, these 'jokes' don't help.
I titter with nervous laughter in the wrong situations - you're right, that is the diffusion of tension in loaded situations.
Laughing does not automatically mean that something is funny
it is sometimes a response to being overwhelmed by emotion.
Being funny, or witty - and these two can differ, some humour is simple and some is sophisticate, but both can be funny - is different to eliciting nervous giggles via saying the most malicious things you can think of.