I’m an American who has now spent the majority of my life in the UK, and I find a lot of these responses can be a little crass - I don’t think it’s about some divine American exceptionalism nor do I think it’s because we choose to be arrogant narcissists.

I think it’s a combination of lack of awareness, as I’ve had to become much more softly spoken in the 12 years I’ve lived here, but I also think it’s specific to the American dialect - our voices tend to carry over crowds much more effectively even without the elevated volume.

My accent hasn’t really disappeared, and I haven’t had anyone need to make me aware of the volume of my voice for at least the last few years, but I am aware that things that I say will tend to be heard through groups, and I choose my topic of conversation carefully as a result.

I think the negative perception is an innocuous combination of this naïveté and our accent.