If it is “a cultural thing” or otherwise entirely well-meaning of you to casually or affectionately touch other people when they DO NOT WANT to be touched, you 100% need to stop, now. (How do you know they do not want? Pay attention. Ask. Or just assume it & leave them alone.)
It's on you if you're embarrassed or humiliated. How about, instead, withdraw your hand and apologize. Develop your sense of others' feelings. Introverts, folks on the autism spectrum, one who's been abused, or those simply uncomfortable with sudden invasions of their space.
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