Why are some people uncomfortable with public display of affection?

Do you feel awkward showing affection in public? Or do you only not like it when other couples do it?

I tbh don't care as long as people don't go TOO far (french kissing and such). I personally like holding hands, hugs and light kisses (pecks) with my boyfriend 'cause we like showing we're a couple.

Why are some people uncomfortable with public display of affection?
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