Americans, why do you think it's so strange to greet with a kiss?

Anonymous
context, some time ago there was a sporting event in my country where many people from other places attended, the American fans were the ones who attended the most, to clarify, I live in a Latin country and here when we already meet someone we greet them with a hug and one or two kisses on the cheek (men usually greet each other with pats or hugs too), but when we interacting with Americans they were very confused and even cold, because of the movies and attitudes we thought they were more liberal so I assume that maybe just They are shy?
Americans, why do you think it's so strange to greet with a kiss?
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