When guys touch you at the club when they pass by..are the touches innocent?

for example at clubs when guys walk pass you,some of them may slightly touch your waist with their hands)not full over you tho) and seems that's just an innocent touch because they need to walk through the very crowded club.

but many people also just walk through,not touch you anything..so I'm just thinking are those small touches really innocent or they wanna hit on u?
When guys touch you at the club when they pass by..are the touches innocent?
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