I have noticed a tendency for this reprehensible technique to be used in argument as follows:
Instead of examining a man’s opinion on any subject we examine the man himself , asking questions such as: is he wealthy? Does he break the law? What does he say about others? Is he a member of any groups? The intention is to invalidate anything he may have to say.
Along with this unpleasant practice we imply that in order to have an opinion on anything we must experience it directly. Only an expert footballer can criticise football; only a doctor the use of medicine; an artist only is competent to criticise a painting.
Just think if these media tricks were taken seriously very few would dare open their mouths. The media would close down and parliament would shut it’s doors.