When the believer (Al Mahdi) sees the Dajjal, he says:
O people! This is the Dajjal mentioned by the Messenger of Allah (saas)". The Dajjal will immediately order his men to lay him face downwards and says: "Take him and injure him!". That person will be beaten down in such a way that his back and abdomen will widen. That time, he will seize him from his both hands and both feet and hurl him away. People will think that he threw him in a fire. Whereas, he will in fact be hurled into a Paradise.
Mahdism and Imamiya, 40
The expression "will be beaten down in such a way that his back and abdomen will widen" is used as a simile. The author of the book titled Mahdism and Imamiya says regarding this portion that, "The reputation of the Mahdi will be continuously announced and spread around". However, since this will be done by the followers of the Dajjal, we can say that this propaganda will be made against the Mahdi.
The enemies of Islam would use the poets, who were considered the press of that age, at the time of our Prophet (saas) to speak ill of him. The poets would insult the Prophet (saas) in many ways at the fairgrounds and marketplaces and call him insane, magician, soothsayer, etc. And now, the followers of the Dajjal, who is the enemy of Islam, will speak ill of Al Mahdi through the mass media and press organs, trying to tarnish the Mahdi's reputation before the people. (Allah knows the truth)
We have seen that the hadiths indicate the first years of the Mahdi will be the years of struggle filled with difficulties and tribulation. The period that we have mentioned to be the "Golden Age" is related to the final periods when the Mahdi will have become the caliph. Only in this period the Mahdi and the Muslims will attain comfort, prosperity and peace and live a life based on love, peace and brotherhood.
Verse interpretation in the indicated meaning:
The Last will be better for you than the First. Your Lord will soon give to you and you will be satisfied. (Surat-ad-Duha: 4-5)