The French President defended the bloc in the wake of Matteo Salvini’s latest attack on the EU.
Mr Salvini has suggested the Genoa bridge collapse was caused by EU constraints placed on Italian authorities.
At least 43 people died when a 200m (656ft) section of the Morandi bridge near Genoa suddenly collapsed under heavy rain in August sending dozens of vehicles plummeting 45m.
He has also been a scathing critic of other bloc members in their approach to dealing with migrants and accused Spain of “encouraging out-of-control immigration.”
Responding, Mr Macron said: “If a bridge collapses, it is Europe’s fault. Are you worried by migrants coming from Africa? It is Europe’s fault.”
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He claimed those who make those comments “are not populists, but nationalist demagogues” who “forget what Europe has given us”.
Mr Macron called on Europeans not to give in “to the will of those who want to take the EU hostage, to the demagogy of those who say that all problems come from Europe.”
Those people, the French President said “want to create divisions, nationalist retreat, they say state lies, they blame others, as if a strange manager took decisions in their place.”
Until seven years ago, he continued, “there was war in Europe” and “now there is no war in Europe and it is a miracle made by Europe”.
Mr Salvini, speaking to Italian newspaper Corriere.it, hit back at his French critic, saying: ”The last one who can give lessons to Italians is Mr. Macron since last year he has rejected almost 50 thousand people, including women and children, on the border with Italy.”
He also advised Mr Macron to “take care of the French, given that he is at the lowest level of popularity, and to be more humane at its borders”.
In June, Mr Salvini blocked the Aquarius rescue vessel, carrying 629 migrants, from entering Italian ports – a move which caused international outrage and condemnation from France.
Mr Macron had accused Rome of cynicism and pointed out that the country with the nearest coastline to the stranded ship bore responsibility under international maritime law.
(Additional reporting by Maria Ortega.)