But you didn't say "we were looking for Indian restaurants". You said you were "going into Pattaya for an Indian restaurant". And from what you've written, Google didn't know that. The only clue was your brother saying out loud "I wonder which one is best?", which could refer to bars, tailors, massage parlours, you name it. So why is Google, or whoever, recommending an Indian restaurant? Sorry, I'm not calling you a liar, just that from what you've written, I can't see how Google would know what he was referring to. Despite conspiracy theories to the contrary, I'm not sure it cannot read your mind.
Maybe your brother did an earlier search for Indian restaurants on Google?