Girls, it's Thai slang and part of a Thai joke. When we really like something, we sometimes rate it 2/10 as a joke to mean it's actually amazing and we love it. In the same way, saying "I don't like it" can sometimes mean it's exactly our type and something we're really into.
If you didn't understand the joke, that's completely fine. But leaving negative comments and judging someone without knowing the context is rude and unfair.
Next time, please take a moment to understand the meaning before criticizing others.
Now it's time to apologize to her.