What does the red flower that people are wearing mean?

The lady in red represents a more exciting life. She is a distraction but also a false promise for something better. Something more exhilarating.

She is an escape from the droll responsibilities of real life.

An escape from doing the right thing.

She represents freedom from the harder roads in life one must take.

She represents everything we've always been told to want and she can make us believe that having her will make our life better.

But will it?

She is Satan's secret weapon... representing all your desires of sex, money and fame.

Through her, you will choose earthly pleasures over heavenly ones (spiritual ones).

Through her, Satan will win over your soul.

He has her waiting for you on every corner.

Can you learn to refuse her?

The lady in red does not actually have to be a "lady in red", that is merely the symbolism. An occult symbolism used by Hollywood and the media.

The lady in red is actually something different for each person. It could be a drug, a dream, money, some sort of worldly trap that can be placed in front of you, designed to take you out of the road.

However "Hollywood" has selected the Lady in red as a symbolic reference to that worldly trap, basically representing "sex" and "temptation".