People should also be expected to be able to read the context and not need explicit confirmation or denial. It's rude and pushy to chase people and try to pressure them into saying yes and force them into saying no.
I can't help but disagree. In order to avoid miscommunication, people should be as accurate and clear in their communication as possible. It's not rude or pushy to expect clear and plain language, especially when dealing across cultural and linguistic barriers. Expecting people to read a context that varies widely between and even within a culture is unreasonable.