insensitive
acceptable
inconsiderate
customary
faux pas
inappropriate
be aware of
not suitable or proper in the circumstances
showing or feeling no concern for others' feelings
thoughtlessly causing hurt or inconvenience to others
means to know about
according to the customs or usual practices associated with a particular society, place, or set of circumstances.
able to be tolerated or allowed
an embarrassing or tactless act or remark in a social situation