Hill Giants FTE?

[Aurorikine]

So I've spent literally hundreds of hours killing Hill Giants and the rule of the land was always HGs are FTE. Today when I mentioned that to someone, he said they are not and there is no where in the rules or forums that say they are. I looked myself to prove him wrong and came up with nothing.
So, did I float along these past years on some fluke that everyone who happened to be around me considered them FTE? Like I put up some shit with such as a monk killing every single HG all afternoon because he could engage quicker than me for some reason. But I didn't complain because I adamantly believed they were FTE. Did I do this for nothing?