Me, not being in the military, but being in high school Junior ROTC had a basic understanding of his fears, and I just told him about how even though I am open about the subject to everyone I know, I still hold a high rank and position in my halfway-possibly-able-to-be-considered-pseudo military hierarchy. I tried to assure him that if his friends really knew him that the most they would do is give him a bit of crap about it, but he did not like what I had to say apparently, and he told me to "shut up because I do not know what I am talking about", Roughly translating for the sake of being vague.
One thing that hurts me more than anything is being told to shut up because apparently, I have no clue what I am doing just because I am still in high school. I know that I do not know everything, but of all things, when I am giving the best advice I possibly can to help, why do you bite my head off like that?
NOW THAT THE ANECDOTE IS OVER: What phrase truly sends you off the handle as being the worst possible thing someone can say to you, and why?
Also, for those curious as to the topic of that conversation:
Spoiler
It was ponies. I know I could have said it at the beginning, but I knew better than to start an OP with "we were talking about ponies, and..."
It was ponies. I know I could have said it at the beginning, but I knew better than to start an OP with "we were talking about ponies, and..."

I even have some really good friends who are what most people would consider "hippies" and even they support me because they know me as a person. Though, If anyone ever does insult me, which I'm sure will happen eventually, I don't really know what I'd say, I guess I'd just smile and wave and take comfort in the fact that I'm proud of myself for what I do and ask them if they can say the same.
I don't know, it's hard to explain to people who don't want to join the military why I, or anyone else, does it.