Elon Musk has no manners while on the phone apparently.

Elon Musk, the world renowned billionare, is known for being very curt an asshole during phone calls.
He hung up on the NTSB chairman during the middle of the conversation, and earlier in the week, in an earnings call for Telsa, he interrupted a question with: "Next. Boring, bonehead questions are not cool. Next?" (source)
He hasn't explained his reason for hanging up in the NTSB case.

credit: tweet, article

ontd, are you rude? (lol) do you hang up on people? do you leave people on read?