Why does the host answer the guest with brief responses during the party?
other guests are asking for the host's attention.
the party is over and wants the guest to leave.
the host realizes the quest is not open-minded
the guest knows the host is also not open-minded

The host answers the guest with brief responses during the party because The host realizes the guest is not open-minded

Explanation:

The third option is the one that best explains the reason why the host answers the guest with brief responses during the party, the other options do not seem to fit with the story where the host interacts with the guests and reacts according to how they are, there is no point in giving long explanations to someone who does not really care about them.

that is the way of a cheater and cheaters get nothing but bad grades and in trouble.