I saw this particular episode.
IIRC there was a first year drama student arguing the toss with Sir R at one point, because obviously people who dress up to pretend to be someone else on a stage or in front of a camera know more about sex and gender than world-respected biologists who have written papers, made ground-breaking advances in fertility treatment and examined the topic from every angle for over half a century.*
Most of us would still be wiping the egg off our faces after such a confrontation, but I think this young woman was too unintelligent to recognise that she had lost the argument and looked very pleased with herself.
(Though ironically Sir R seriously considered a career in the theatre and left clinical medicine to work as a theatre director. He was pretty good at it and won a National Directors' Award at the Edinburgh Festival in 1969. Happily for humanity he returned to medicine.)