Hmmm, as far as I know, this did vary from time to time, and from one social group to another.
The intellectuals were mostly a bit of Francophiles, while the farmers, the workers and the artisans were more pro-German. Social security and pensions for invalids came along in the late 1870s and later, and they vere welcomed. More and more, the people of Alsace-Lorraine did arrange themselves, especially after 1911, when Alsace-Lorraine was finally granted autonomy and legal parity with the other German states.
Still, some misunderstandings persisted, as the Zabern affair of 1913 showed. However, it was blown vastly out of proportion by the French media in France.
There had been a turnaround recently before, after, between 1890 and 1905, revanchism in France had died down to some degree.
However, with the Morocco crisis of 1905 and the reassuring through the Entente cordiale with Britain, it intensified again and the French media did their best to pour fuel on the fire. People like Hansi and Zislin, vile caricaturists in service of France, are famous or infamous to this day.
Hansi, who is today mostly known for his mawkish genre postcards, had plenty admirers even in our days. This, however, declined somewhat when it was found out recently that he was not only a Germanophobe, but also a radical antisemite. Some of his early drawings have an uncanny resemblance to similar “art” in decidedly antisemitic papers.
I should add, one of my more distant ancestors was Alsatian. He came to the US prior to 1870 precisely because he did not want to be drafted into the French army and forced to fight the Germans (he considered himself German as did plenty of others).
Thank you Menes for pointing out about Hansi - I had never heard of him before. I find it interesting that his surname was “Waltz” meaning ethnic German, but he was a French patriot.
In Poland I see the same - there were many ethnic German (well, Saxon) families that Polonized like the Schulz, Merklein, Wedel etc. and alternatively there were people like Dostoevsky who was pretty definitely ethnically a Pole but was a Russian patriot and anti-Polish.