AITA for being rude to the person on the bus who insulted me?

Hello everyone, this is my first time writing something like this and I would be grateful if you understand that my English is bad and I am writing from a translator. I’m Kyrgyz and currently living in China. I have a friend from Russia, and we recently decided to go for a walk to the Yutown shopping center. On our way there, we boarded a bus because we wanted to save money. While sitting there, people chatted for a bit and soon fell silent. We didn’t even notice and were chatting calmly the whole time.At some point, a Chinese guy started shouting something loudly in English. I didn’t understand, and my usual defensive reaction is laughter and a smile. I smiled and laughed, but my friend got angry.It turns out he said, "Shut the hell up!!" (I don’t really remember exactly how he said it, but he said shut up and mentioned the words "mom").When she told me what he said, I felt ashamed, because he was probably a tired man and wanted silence, and not conversations from foreigners, even though we weren’t making noise.But my friend got angry with him and spoke dissatisfiedly about him, and I was embarrassed and began to remain silent, while at the same time all the other old people looked at us and grinned.Soon our stop came, we got up and got out and this guy opens the window on the bus and starts shouting "Bitches!!" and some unpleasant words in English.I felt uncomfortable, because he was like over 40, and we were only 14. My friend started yelling at him, "Son of a bitch," and showing him the middle finger (he did the same, he started it).He disappeared soon after the bus left, and my friend tried to console me, saying it wasn’t our fault, but I still think it was my fault. If anyone’s reading this, please share your thoughts,I’d be interested.(I forgot to add, I also called him a bitch when he started yelling at us from the bus window)