Respecting others, valuing their perspective, and being sensitive to their concerns is diplomatic.
To be diplomatic may be defined as being politically correct, in other words. the avoidance of expressions and actions that may offend people.
According to the dictionary, diplomatic means, skilled in dealing with sensitive matters or people,also tactful.
A deplomatic person is viewed as someone who doesn't take sides in an argument, but who helps others solve their differences or facilitate discussion.