It may be one reason, but it's not just the layout that is putting me off. I've been a DR1 member for 14 years. When I first joined, I found it to be a wealth of information for newbies like me. And as my experiences grew I enjoyed contributing and helping others, in return for a "like".
Today, in my opinion it feels more like a platform for grumpy old men who love to argue behind the veil of anonymity. I also feel that the Off topic section has tainted this website. It is not possible to hold civilized discussion with so much diversity and division mainly from the American members.
The help section has now migrated to Facebook. There are some genuinely helpful people for expats there and all you have to do is click on their profile to see who they are.
You are correct. There is definitely a strong anti-American sentiment possessed within from the Brits.