Although I'm not the consular officer, and only he can tell you for sure, it sounds to me like the problem was less what she said and more what you said. When asked about the short-term nature of your relationship and the rapid progression from divorce to engagement to marriage, you "became very confused" and rather than explaining you apparently starting to question what right he had to even ask you that question.

If you get a denial letter, the letter will include information on how to appeal (by filing USCIS Form I-290B with the office that made the decision). You can then either appeal, or build your relationship and try for another visa at a later date. The denial of a K1 visa is "without prejudice" meaning that the denial shouldn't affect your subsequent application; but you may want to consult an immigration lawyer before reapplying to make sure that you've resolved the issues that are most likely to be of concern.