If you wanted to rank congressional districts by markers that might suggest they are the “worst” there are people who do that. Take this list of districts by median household income. (NY-15 is dead last, with a median income less than half that of MD-7.)
There are rankings for districts by life expectancy (last is Kentucky’s 5th district) and educational attainment (last is Texas’ 29th district).
My point is that to believe that Maryland’s 7th district is “the worst” you have to know basically nothing about American life. Because not only is it not “technically” the “worst,” it’s not even close. By every conceivable measure, MD-7 is on the high side of average.
Does it matter that the president of the United States doesn’t know any of this?
Does it matter that he’s lying when he says that other people agree with his incorrect opinion?