"No objective truth" is basically calling the Lord Jesus a liar, and the folks who fall for it either don't get it or don't want to get it.
"“Do not let your heart be troubled; believe in God, believe also in Me. In My Father’s house are many dwelling places; if it were not so, I would have told you; for I go to prepare a place for you. If I go and prepare a place for you, I will come again and receive you to Myself, that where I am, there you may be also. And you know the way where I am going.” Thomas said to Him, “Lord, we do not know where You are going, how do we know the way?” Jesus said to him, “I am the way, and the truth, and the life; no one comes to the Father but through Me." (John 14:1-6, NABS, emphasis mine)
Not to mention that Scripture records repeatedly in the Book of Judges that "In those days there was no king in Israel; everyone did what was right in his own eyes." Maybe that's the problem with those who see "no objective truth"...
...maybe they really have NO KING.