depends. Hugging is fine and holding hands. Just a innocent kiss is fine too ( kiss on the cheek quick kiss on the lips) . If it's just sucking off each others faces or groping, I don't think many people want to see that.
Personally I don't mind hugs at all
, holding hands when i'm in a relationship depends. And personally I don't like to kiss or kiss in public at all.( rare thing to happen )