Disabling FKs does not help. You have to drop them.

$ oerr ora 02449
02449, 00000, "unique/primary keys in table referenced by foreign keys"
// *Cause: An attempt was made to drop a table with unique or
// primary keys referenced by foreign keys in another table.
// *Action: Before performing the above operations the table, DROP the
// foreign key constraints in other tables. You can see what
// constraints are referencing a table by issuing the following
// command:
// SELECT * FROM USER_CONSTRAINTS WHERE TABLE_NAME = "tabnam";


And the manual says:

If the table to be dropped contains any primary or unique keys referenced by foreign keys of other tables and you intend to drop the FOREIGN KEY constraints of the child tables, then include the CASCADE clause in the DROP TABLE statement, as shown below:

DROP TABLE hr.admin_emp CASCADE CONSTRAINTS;