Using the average in an unequal society like Mississippi to compare against the more egalitarian France distorts things badly.
The mode for French income is about USD$22,000/yr, in Mississippi is closer to USD$15,000/yr and on top of that Frenchman pays virtually zero out-of-pocket for healthcare, university, or childcare, and benefits from robust public transit and mandatory 5-week paid holidays. If you are a normie, there is absolutely no doubt where you are better off.
The post is just another example someone on twitter using lies, damned lies, and statistic to do some good old Yankee flag waving.