It can certainly feel like that, but after looking into Brexit, I think we (USA) have things MUCH better.

As much as Trump is loose cannon, our trade was based on the USA being the 'importer of last resort' and many of the changes we're making are not THAT extreme compared to history, or compared to other developed nation's existing rules. Plus we are the ones choosing to make these changes.

With Brexit, GB has failed to make any sort of deal or even seemingly understand their negotiating position. The 'deal' they're eventually going to receive is 'having EU non-member rules forced upon them'.

Furthermore, even if the USA did the same thing and pulled out of all treaties instantaneously with no forethought or negotiation, we're a big enough economy that other countries would be forced to negotiate. Check out the comparison of US and UK economies. http://www.nationmaster.com/country-info/compare/United-King...

The diplomats and Foreign Office well understood the negotiating position, and probable consequences. Which is why a selection of senior figures have resigned over the last two years. Just one example: https://www.bbc.co.uk/news/uk-politics-38498839

Britain appears to have gone with the intent of negotiating by political dogma.

Yep. It's actually one of the main reasons I haven't applied to the Foreign Service. I think working as an FSO would be super neat and interesting, despite what all it entails, but I couldn't sign up to do it knowing what would likely be coming.