The real reason this dude is so mad, is because he couldn't keep Dr Ford's mouth shut like when he was trying to rape her. Her fight against him stopped him from getting what he wanted then, and now her words and courage are trying to stop him from getting his lifetime dream job. Except this time, he doesn't have the power or control he had back then. Instead of laughing, he's angry, he's uncomfortable with not being able to stop Dr Ford from speaking out. He would love to put that hand back over her mouth and make sure nobody hears her once more, just like he did 30 years ago.