Why did this guy I met online seem so angry?

Meet up with a guy I was talking to online, to hook up. Met at his house. We both looked like our pictures, neither of us catfished eachother. (But he was much shorter than he claimed). When I got there and we got down to business, I noticed he had a very angry, suspicious and wary look on his face. Gave me a total psycho stare, even though I was smiling at him. And he couldn't look at me for long, he kept looking down like he couldn't bare the sight of me. (Despite the fact I'm way better looking than him) I was almost gonna turn and leave because he was so creepy but I felt compelled to stay after he locked the door behind me. After I pleasured him he was happy and friendly. He smokes weed everyday. So what was his problem?
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Also, his pics on tinder he was smiling and looking very chilled, I so was stunned to see a very tense, awkward, angry twitchy man.
Why did this guy I met online seem so angry?
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