I have some personal experience in this matter. My prior account(haploid) was silent-banned for, presumably, daring to question the orthodoxy that parenting is the best accomplishment one can achieve in life.
I don't know if this meets your criterion of "clearly [in]appropriate", but I would hope that expressing an unpopular opinion would not.
I don't know if this meets your criterion of "clearly [in]appropriate", but I would hope that expressing an unpopular opinion would not.