I suppose everyone has their own preferences when it comes to food, but we British don't all eat porridge! I think it's OK but I very rarely have it, and I didn't know it was considered strange by Europeans! Marmite is the classic "love it or hate it" food, even the TV adverts acknowledge this! And some people like marmalade on their toast. We do have things like croissants but over here it's a bit of a novelty, not the kind of thing people eat all the time. Even though there is the "Full English Breakfast" (eggs, bacon, beans etc.) the difference between Britain and American is that we don't really go out to diners like IHOP for breakfast and eat loads of pancakes and waffles etc. But perhaps the average American just has breakfast at home. For breakfast I usually only have a bowl of cereal.

And I don't eat fried Mars Bars! That sounds revolting! But I have no idea what percentage of the British population eats fried Mars Bars.