When I entered the US as an new immigrant at LAX the immigration agent there was almost comically rude and aggressive with me. He keep on shouting at me, telling me to do things but not explaining what that entailed, he even refused to lend me a pen when he told me to sign the paper. I was just some random person in line and had never seen him before.
I don't know what his problem was but I didn't care. I was going to get what I needed regardless.