Located in the United States, theres generally not many Cambodian restaurants and many that do exist are bundled up with Thai or Vietnamese cuisine. This meant a majority of my experience with my wife and her family was eating at non-Cambodian restaurants. The few times we did go to Cambodian restaurant it was Vietnamese or Thai bundled up. My in-laws don't cook so never had a at-home dinner with them. I'm Asian too and felt bad we never went to their cuisine and assumed they were avoiding Cambodian restaurants out of convenience for others.

A few nights ago I decided to surprise my wife and in-laws by bringing them to a authentic full-blown Cambodian restaurant. No Thai or Vietnamese dish. From the start it was awkward because I didn't know Cambodian dishes and I came in expecting them to be excited/happy, and take over in ordering. In reality my in-laws and wife were pretty stoic and pretty much had me order dishes from the menu. After dinner and saying goodbye, I asked if something was wrong with the restaurant I chose, and thats when I found out that her family doesn't like Cambodian food. She assumed I would've realized that since they never went to or chose Cambodian restaurants.

For the curious, one uniquely Cambodian dish is fish amok

TL;DR Cambodian restaurants are not common. Thought it would be a nice gesture to take Cambodian in-laws to Cambodian restaurant. Wife and in-laws were indifferent and it felt like they were going for me. Find out after they don't like Cambodian food.