That's a common misrepresentation that the government is very happy for us to believe:
- when the government isn't happy with european law, they just ignore it; see also data retention laws and anti-Rroma laws in France which are famously illegal by european standards
- who controls the EU? the french government is one of the key players (along with Germany) controlling the european commission; french interests dictate what becomes european law
> average income
Minimum wage and taxes on fortune are determined by France, not by the EU.
> industries going abroad
This is determined by private industry, not by EU. However, the french government has powers to nationalize those industries, or requisition them, or help the workers self-organize the production (eg. by fundraising to keep activities going). They are just ideologically opposed to that (because they're capitalists), despite all their broken promises for the workers. 1336 and LIP are famous French examples of what workers self-organization can achieve when the government doesn't get in the way.
> pushing to welcome more immigrants
This is controlled by France, not EU, and France is definitely not welcoming immigrants. France has closed its borders (for people, not merchandise) many times since 2015 in contradiction to the Schengen treaty. There are many people dying on the French border, and the government couldn't care less (see also Aquarius scandal). France has also been condemned by the european court of human rights for deporting people before they can apply for asylum at the italian border (which is illegal in international treaties). French police is hunting for undocumented folks; you can see them in the metro in bigger cities controlling anyone who isn't white so they can deport as many people as possible.
> become jobless due to the loss of our industries
We become jobless not through lack of industry, but because the work and resources aren't shared. We live in one of the richest nations on Earth, and we could all work 5-15h weeks and enjoy modern comfort. But people in power like it that over 10% of the population lives under the poverty line. Once again, this is due to the french oligarchy, not the EU.