As shown by the criticism coming from both Christians and non-Christians, the expressions of "real one" are offensive to some. Offensiveness does not attract people to the gospel. It turns them away. I think it shows a poor understanding of human nature to think the truth will attract honest-hearted persons regardless of how it is spoken. If the way it is done is offensive, that would result in stumbling people away from Christianity instead of drawing them to it. As Jesus said regarding some who claim to follow him: "Whoever causes one of these little ones who believe in Me to stumble, it would be better for him to have a heavy millstone hung around his neck, and to be drowned in the depth of the sea. Woe to the world because of its stumbling blocks! For it is inevitable that stumbling blocks come; but woe to that man through whom the stumbling block comes! (Matthew 18:6, 7)
We become stumblingblocks if we appear self-righteous and "holier-than-thou." Perhaps that is not the mindset of "real one," but he does give that impression. None of us is Jesus, and none of us has authority to speak the way he did at times. When two apostles decided to call down evil upon unbelievers, Jesus "rebuked them." (Luke 9:51-56) I think he would equally rebuke any of us who think we have the sinlessness and purity of soul that would qualify us to condemn someone else's faith or lack of faith.
Oftentimes it is not our words but it is our conduct that wins others to Christ. "Keep your behavior excellent among the Gentiles, so that in the thing in which they slander you as evildoers, they may because of your good deeds, as they observe them, glorify God in the day of visitation." (1 Peter 2:12) A Christian wife, for example, can never hope to win her unbelieving husband to Christianity if she nags him about what she believes is "the truth." As Peter wrote: "In the same way, you wives, be submissive to your own husbands so that even if any of them are disobedient to the word, they may be won without a word by the behavior of their wives." (1 Peter 3:1)