How do you feel if you found out that your husband complain your parent in internet forum? Would you accept it?

That’s definitely something unpleasant and it shouldn’t be shared with people on social media . On the other hand I also feel that he has a problem communicating with you or your family . I think it would be better if you talk to him . Try not to pin point his mistake but rather find out the problem first and then tell him that’s not right and you’ll attend to his concern .