Was Greece the birthplace of humanity?

[Thryleon]

In terms of my test, it is truthful and provided it's not mean spirited, as upsetting as it is for someone to be called fat, it's it's not really taboo.

Even then you still probably should bite your tongue.

Everyone knows better than to comment on overweight people as being fat.  Some people do have real issues managing their weight. 

It's the same with ugly.  You don't call someone ugly even if they are.  It's hurtful.

Now you have picked two circumstances where my rule falls over somewhat but then you simply have to put yourself in the shoes of the other person and instantly you get a read on if it's ok.