Many people in this forum don't buy into the idea of AML assessments and classifying bitcoin in different groups based on their "dirtiness." Each bitcoin is the same as any other bitcoin on protocol-level. Anything else is just nonsense created by malicious institutions and their government buddies meant to control you, legally steal from you, and hold back bitcoin adoption as much as possible.
@OP: do you also check AML records when you receive cash from someone? Of course not, money is fungible. Without fungibility, money can't exist, and the same goes for Bitcoin.