How would you feel if your gf allowed a man to sit on her lap at a cafe?

So I (m18) am currently casually seeing a woman (f20) during my exchanges in Korea. We are not in a serious relationship but she has said she really likes me and I do love her. However, she sent me a picture of her at a cafe that was posted on her friend’s story. She was sitting on a table, where a guy was sitting on her lap, and she was putting something in his mouth. I understand people say it’s Asian culture, and they were just goofing off but I’m still hurt. I asked her about it and she said she didn’t care and it was okay in Korea to sit like that. She’s allowed a friend to sit on her lap before (but not that close) and they’ve done things like that before. I asked her why she doesn’t care, and she said it’s just a joke and there’s nothing wrong with it. I told her how I felt about it and she said to basically drop it.<br><br>I want to ask how other men would feel about it, considering I’m currently overseas and don’t know how to approach this. There’ve been other things that have made me uncomfortable but I’ve let it go thinking it’s Asian culture.<br><br>TLDR: How would you feel if your gf allowed a man to sit on her lap at a cafe?