She didn't 'politely' emphasise anything, Sunshine.
And her OP didn't say 'Which name do you prefer the sound of?' All it said was 'Etsuko or Emiko?' If she wants specific types of answers, she needs to bother to write a more specific OP.
I clearly wasn't the only person who found her tone rude, either. Really, no stranger on the internet could give a toss what you call your child. If you can't be bothered posting an intelligible OP (e.g. 'I'm having a baby girl and I like Etsuko or Emiko; which do you prefer the sound of?'), then don't be short with people who make the effort to engage with you.