I'm afraid this reflects more on you than him. You could do worse than listen to one of these programmes and learn how many of his jokes you have laughed at over the years.
http://www.bbc.co.uk/search?q=I%20Write%20the%20Gags%20-%20Barry%20Cryer&suggid=urn%3Abbc%3Aprogrammes%3Ab06s9sk0