There is a fine line to be walked here.
On the one hand, as a period piece, the dialogue must retain the attitudes and predjudices that made that characters who they were.
On the other hand, modern society cannot simply suspend the progress it has made in eradicating bigotry simply to pretend for an evening that such attitudes are - or ever were - acceptable.
I am sure that a writer of the calibre of Eric Chapel can walk that line successfully - and leave out the more outre references to Rigsby's small-minded attitudes to race and education.
Audiences are more sophisticated these days, sledgehammer satire is no longer required, you can subtley lay the attitude down in the script, and let the audience build the inference for itself. That way, the only offence caused should be to people who are actively looking for it in the first place.