Just because someone has not responded to an email in a few days doesn’t mean they’re angry at you. It doesn’t mean they don’t like you. It doesn’t mean they want to stop talking to you. They most likely forgot.
Expect to send at least a couple follow up emails. If the person you are emailing is famous or important or a leader of some sorts, expect to send even more emails. They have a lot on your mind and your email can slip through the cracks.
In general assume forgetfulness or laziness before malice.