spath - // OK, so the comedy of a bygone era, can't be compared to that of what Jo Brand said..
The comedy of a by gone era would offend a large % of viewers, be them black people being offended of racism, or women being offended over sexism or large populations of people being offended by social stereotypes. //
In essence that is true, but the reasons why comparisons don't stand up are rather broader than that -
Society as a whole has developed and moved on from the 1970's, and as humour is an integral part of society, it has developed and moved on.
It's not possible to compare like with like in terms of Ms. Brand's comments measured against 1970's comedians, so it's not really worth pursuing that line of debate I believe.
// What Jo Brand said offended 19 people, not a large % of the audience at all. //
That's not strictly accurate - it offended 19 people who were sufficiently offended to make a complaint - there are no statistics for the numbers of people who may have been offended, but not sufficiently to take action and make their complaint official.
// There for, this comedy is not comparable to racism, sexism, social stereotyping or any other comedy of a "by gone era". //
For the reason I have given, that conclusion is invalid, but more because of the inability to compare two styles of humour.