YOU expected it, but not the other party. Sex is an act between two or more people, consensually. Without both parties being in agreement that they want to have intercourse, it isn't something you should expect.

I think it’s normal but that it shouldn’t be. The person is mad because they expected sex but I don’t think sex should be an expectation ¯\_(ツ)_/¯

Disappointed is understandable but anger has no place in the scenario. Expecting it is a selfish one sided approach and is more gratification for self than caring if your partner is on the same page.

We all handle our emotions differently. If you're angry from being rejected, you have that right. It's making it the other person's problem when it becomes an issue. If the angry party were to take some time to themselves and decompress before lashing out, the problem a could be avoided. Discussions about the emotions and feelings of rejection can come later when everyone's emotions are more controlled. If the anger persists, the parties involved need time apart until they can communicate calmly and safely again.

Perpetuating the idea that anger is a normal response to not receiving consent from a potential partner is dangerous. 'Normal' is often confused with 'justified' when the two should be distinctly separated. Whilst anger might be a common reaction, that does not make it justified. I believe it is mutually exclusive that a person could respect their potential partner and feel anger that they should not want to have sex for any reason. The implication is often that there is something 'owed', therefore viewing something as transactional that should be inherently relational. Disappointment might be justified but it should never manifest as anger. If there is not the basic level of respect for each other that allows for genuine consent, then the relationship is not a healthy one.