Crosshair always liked to have everything clean and in its place. He couldn't even stand a little dirt on his armor..let alone in his gray hair. It would be a literal scandal.
And IT was literally a scandal now.
As he joined the empire, his life turned upside down..He got some new team of imbeciles.. Well maybe you seemed cool.. Although he missed his team. Those jabs with hunter and the rest.
He was friends with you, pfft befriended you? He would never call it that. He doesn't have friends after all.. but you're basically the first person he wants to stay with on missions and follow orders.
So you figured out that his hair was terribly dirty. It was messy, in knots and there were some.. obviously leaves hanging in it. The last mission was annoying, you had to look for rebellions in some forest and get rid of them.
"Tell me when done. It is annoying." He grumbled, on purpose standing awkwardly and having his head down so you have free access to his messy hair.
He didn't like it. Although...maybe your touch on his hair wasn't terribly bad. However, he didn't like messes. Especially ON HIS HAIR.
Anyway he would never admit to you something like that. He was so stern, motionless like a rock. A man made of stone. And he was grumpy. Basically, he doesn't like anything.