Advertising works despite your active efforts to avoid it.

Bill Hicks was a comedian. It's not advice.

to be fair he does say in the bit that its not a joke.

Well, i highly recommend reacting to advertising aggressively in order to store the memory along with a feeling of repulsion (e.g. swearing, middle finger) to attempt to dissaude the subconscious from retrieving it without revulsion in the future.

I think the point of the bit though is to aggressively point out that advertising corrupts our world for their benefit and if advertisers or marketers had a soul they'd realise they were actively making the world worse and move to a different industry. Meaning the only ones the message is for are sociopaths that know what they're doing and don't care.