Is it a bad manner to eye wink on others? It depends! If your intention is good, winking eye is one form of a gesture to acknowledge our presence.
I think there are many forms of eye winking. A wink with a smile on our face could be a 'Hello' or a 'Hi" or "How are you?" I do it quite often, especially when the time and space are too short to express my words out. That eye's wink makes my friends feel so good. Of course if they are from the heart, the recipients could also feel them. If I add my thumb sign shown together with the eye's wink, it means 'You are great!' Not one word is spoken, but the recipient understands this appreciation. This gesture is even more powerful than verbal. However be careful because some abusive men could eye wink with a bad intention on women. And normally experienced ladies could also sense their unpleasant approaches. The best way to avoid such unhappy contacts is do nothing and walk away from these crowds.
A sexy eye's wink could express as 'I'm horny!' or 'I need you!' Whenever I wink my romantic eyes in the late nite, little darling would understand what I want. The funny part of life is, ladies seldom wink their eyes on men and I wonder why they don't do it. Are they shy? Hopefully some female readers are brave enough to reveal their thought here.
Do you know - "Gestures, in love, are incomparably more attractive, effective and valuable than words" - Francois Rabelais