Europe has very low restrictions on imports, because it tries to implement free market as purely as possible. Many voices in France say we must be more aggressive on importation taxes, and that even US has a more protected market than us. After all, no west country can beat China in production costs.

Problem is, those voices are mostly from nationalist and xenophobic parties. Even current left wing french government would not touch total free market.

Now, there is the insult. Saying french workers work 3 hours a day is totally stupid. Normal work day is 8 hours for private sector, and 7 hours for public sector (but most public sector workers work 8 hours and then take a day off to compensate over worked days). The reason because average hours per day is low (see other comments) is because unemployment is high, so many people accept part time jobs and short term jobs.

Now, combine the cynical stance "we can produce cheap products in China and sell them to you with no penalties" and the insult, and you've got perfect food for nationalist parties. Once again.