The thing with Imperial measurements is that none of them logically fit with another. That they make sense is because we grew up with it from a young age. Otherwise, there's no obvious relationship between teaspoons, tablespoons, ounces, cups, quarts, gallons... ounces, pounds, and tons, or inches, feet, yards, and miles. Whereas in metric, everything is multiples of 10/100/1000. This makes so much more sense, except for those of us who didn't learn it this way to start. Whatever one learned when they were young makes perfect sense to them, because that's the first way they learned to frame the world.
It's really like a language, where things that a native speaker takes for granted in their language make no sense in others. For example, English nouns don't have gender, so for us to learn another language takes additional effort and many people think it's stupid that other languages do. And the adjective goes after the noun in French? They think it's just as stupid that we put adjectives first, and that our nouns don't have gender.
There's nothing inherently wrong with any of these things - but as humans we generally look at anything that isn't "our" way as inferior.
. Growing up with it from a young age, it still doesn't make sense to me. I still have to do the math to figure out if my 3/8" socket is bigger or smaller than my 5/16" 
