I actively encourage correction although very few will do so, I have developed the art of reading their expressions and as soon as I see the signs I say "how should that be said?"
TBH I am very lucky if I am allowed to speak and even luckier if one just person actually listens to me, I am constantly interrupted, have my conversations finished for me, told that they know what I was going to say, or just completely ignored in a very obvious manner which brings back memories of my childhood when told "children are to be seen and not heard"
I think that it may considered rude amongst the French to correct though as my good friend who does (she was my teacher) will only do so one to one and never when others are present, although she will explain to them what I meant to say, I ask her and she says it doesnt matter, yet clearly it does when we are alone.
I have encountered a couple of guys that love to correct the English in a very public and humiliating way but they are just bullies through and through, the apologetic expressions of the others says it all. Doesnt sound like your person was one of them Idun.
For the last few months I have had several soirées, the only times that I have really enjoyed having guests in France as sadly those that dont want to let me speak or are incapable of listening are even worse in my house, I think that perhaps they get drunk before coming through fear of eating something alien, anyway these evenings are with 3 young teaching assistants (down to 2 now soon none at all), what is so refreshing is that when one of us speaks the others all listen actively, no interruptions other than to discuss whatever word is not understood which often turns out to have been wrong so its a group correction thing, these will be my fondest memories from France.