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? I don’t get it, isn’t the person installing critical safety features in an automobile performing a valuable social function?

The joke is that BMW drivers don't use them.

Not familiar with that meme/stereotype…

Many people merge without using turn signals, but the subset that do it where you will notice it (e.g, close to you) seem to often be in BMWs.

I don’t know if anyone has ever actually done a study. Would be amusing.

Sounds distinctly like a Bay Area/populated city thing.