do you blow in the public?

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I hate it when I have a cold, first I'm so shy to cough, like, I would really try to control it, honestly, I'm so embarras, especially when I have a runny nose. Goodness, I'm so shy to blow in public, even when I'm in the bathroom I'm still shy. so what I do, I would flush the toilet first so no one would hear me blowing my nose. But then, I wonder why some people don't care,my mom, my seatmate, sometimes it bother's me but guess I should not care. do you b low your nose in public?