This is the first time I hear this and I doubt it’s true.
Typically the distinction is made between 50 and 60 Hertz, where 60Hz is typically considered safer(though I’m not sure if this is even true).
I am an electrician hence why I am curious.
I was told by the supervisor of my high voltage lab as part of the "one hand in your pocket" speech. It's also not hard to find similar statements via Google. Neither are definitive sources.
Ok, well it’s wrong. 230V is more dangerous than 110V, all else being equal.
It's not wrong. 110V is more likely to cause fibrillation. Fibrillation isn't the only way AC can kill you so which is more dangerous is more debatable.
The problem is that the risk of death is so low for both that people's perceptions are skewed. Everybody has been shocked by their household voltage a bunch of times, so they think it's no big deal. Until it isn't.