So what they are saying actually is that the constitution and bill of rights don't pertain to Washington DC. I get it now!
Article I, Section 8, Clause 17 (if I counted correctly)...."The Congress shall have Power to exercise exclusive Legislation in all Cases whatsoever, over such District"......also, Clause 18, and, also, Article III, Section 2, Clause 2, and, also, Article IV, Section 3, Clause 2,and, also, Article VI, Clauses 2 and 3.
It is very clear, in the U.S.Constitution, that Congress shall decide such matters.