That's the biggest problem that I have with the political left ...
Picking a case - which must be said is fairly 'stupid' - in order to disqualify opponents as "racists", while it's primarily a case of exagerated patriotism. There's nothing racist in wanting somebody to sing a national anthem. It might be stupid but it's not racist.
However those leftists wouldn't realize they're defending a guy who earns €1484 per hour, just for kicking a ball against a party, which is very much socially oriented.
The French FN has nothing to do with libertarian like Dutchman Wilders or like pro EU Belgian De Wever. They want to exit the Eurozone and take money creation back into Public hands, lending money to the state at 0% interest rate. Nobody even on the far-left proposes that.
OK that is an idea that they filched the UPR, but still they propose that.
Oh and as a monarchist, I of course have to say that I hate the Marseillaise too.
This should be the French anthem