Knee jerk intolerance is one of the countless flaws found in all people to varying degrees. This is what the Bible teaches. So the comment was not inconsistent with true belief.
The point is that atheism cannot explain the existence of objective morality. All it can do is support the existence of subjective morality—for example murder would be no more immoral than picking daisies, it’s all only opinion.
I would say an objective morality is one that considers the well-being of humanity its highest priority. Before you point to Marxism as an example, I’ll point out that their naïve belief in forcing financial equality is NOT in the best interest of humanity, and that believing in God wasn’t enough to invest the Muslim world with a morality we can really rejoice in.