the art of annoyance

I am so pissed off right now. I was waiting for a train to take me to work and suddenly someone touched my shoulder lightly. I was surprised because people dont usually touch strangers in Tokyo. I look over and its this russian exchange student and she asks a question (in English) about the name of the line but she muddles the vowels and so I say "sorry where are you trying to go?" hoping she'll at least be able to nail the pronunciation of her destination. She pulls out an English map and says "here." I totally know the station and so just as I go to explain it to her this Japanese dweeb steps--literally-- between us and starts blabbering at her in Japanese about how to get there. Now there were tons of Japanese people on the train platform so she clearly had more confidence speaking English, thats why she picked me. But this was a nationalist geek (believe me, thats really a type in Japan) so he thought he would interrupt and "help" in Japanese but she didnt get it and his assumption I couldnt help her was uber annoying too. I said in English "Dude, she doesnt speak japanese. Let me finish explaining." She said in broken Japanese "Little Japanese speak" so I shrugged said "ok, he'll help you." and let the dweeb take over. She clearly didnt get it. He pointed to the ground and said in Japanese "Not this line, you should go down stairs." and she answered in English "Oh, take this line?" My train was coming and I would be late for work so I had to take it. So I said to the lady in English "Not this line, maybe get help at the station" (because they often have information centres, and I didnt have time to help) but the Japanese guy literally stepped infront of me to cut me off so I couldnt help her in English. GAAAD! And he got on the same train as me. As we were getting on the train, I said in Japanese "What the hell man? She couldnt understand your Japanese!" and he said "Yes she could." And I said "Huh? No she couldnt." and he replied "I was just being nice." and then we were in the train and pushed in different directions by the crowds. I was left with confused feelings. Yes, it is Japan so she should learn Japanese... and, yes its good to try to be nice to strangers. But darn it, he just butted in and made it so I couldnt help her and made her loose a chance to get help. And his attitude was so annoying. Gaaaad!