In my youth (long ago!) we used to say 'ideologically unsound', which just about instantly ceased to be an expression you could use seriously: people who have ideologies, sound or otherwise, are slightly ridiculous in everyone else's eyes. Maybe the problem with (non-)PC is there are no comparative forms, like 'a bit non-PC' , or 'rather non-PC'? I think if I wasn't meaning to be ironic (as when talking to Americans, for example!) I'd prefer to say 'thoughtless' or 'inconsiderate' or 'rude', which would convey what I really meant to say.

Incidentally, 'chairman' is technically not gender-specific, like 'mankind', but maybe that's a bit pedantic in post-PC times?

Steve