Firstly the audience loved the jokes, they laughed at them all. It wasn't like he delivered them to stunned faces and immediate shock. The only thing that brought him down was a newspaper reporter noted it down and newspapers pushed it as an artificial scandal. Everyone buying 5 pound earrings knew they were of very low quality, they just didn't want it being shouted at them in their daily news.
Secondly it wasn't even the first time he had publicly made these sorts of jokes, in fact it wasn't even the first time they had been published in the papers.
This was entirely a newspaper driven downfall, they wanted to see him fail and wanted to sell papers about a scandal, so they did.