@lostforgottensoul, understanding "why" does help... but even understanding doesn't help 100% of the time.
Let me give you an example. It's Memorial Day... it sucks for my vet. He lost 8 guys under his command. I get it. Every year the week or two leading up to it starts with a shitty, short tempered attitude, then eventually winds up in an isolation period. It's like clockwork. It get it, and I don't blame him. I give him space, don't contact him, and try not to take it personally.
Today I did a food drop. Went over, dropped off food and smokes, picked up the trash by his chair and dumped his ashtray. Got him a drink and made him a sandwich. Then I left, taking his trash out with me. All this without a word exchanged. I know he's not up to talking, and he knows I don't expect him to talk to me.
He can however, a few hours after that, get on a mutual friend's Facebook and comment on her pictures. I'm not jealous of her and I don't think he wants her sexually because he commented on vacation photos. However I fully admit to thinking "that motherf*cker!!!" when I saw it. He can't even mutter "thanks" to me, but he can type sentences to her.
I get it. It's harder to interact with me blah blah blah blah bullshit. I logically understand the hows and whys. I still get irritated at times.
And that's what this all boils down to... supporters managing that irritation. We can't change anything, so we have to learn to deal with it.