Deep down, most chicks are looking for a hero in one fashion or another. Women like to talk. Women like to talk about themselves. Women like to talk about other people's business. Women generally lack discretion. It doesn't have to be something in your vibe that triggers it. It could be attributed to her comfort level with you. I can't speak to it being a cultural thing among Thai women. All you can do is respond with, "Really? That's just AWFUL!" and try to redirect the conversation. Try not to be directly rude until AFTER the bang...HA HA!
"The best kind of pride is that which compels a man to do his best when no one is watching."