AITA? Got heckled at Kalighat metro station

I'm on a trip to Kolkata from another city. I don't know much Bangla, just about enough to try and explain to people here that I don't speak it but understand a little.

I was waiting at the station. I just put my hands on a railing there. As I understand it, I wasn't endangering myself or anyone. No train was passing at the time, and I wasn't anywhere close to an open edge, so I wasn't at risk of falling on to the tracks. I suddenly hear a loud "Oye goru" and this guy in a shirt, jeans, and Ray-Bans motions me with his finger to step back, and that too in a way I found supercilious and arrogant. He waxed eloquent on niceities of metro etiquette that I unfortunately couldn't understand as it was all in Bangla. He claimed he couldn't speak any language I could (which I find hard to believe—his mode of dress implied the sort of privilege that makes you at least bilingual, and in urban Indian centers, this tends to include English) but when I tried to explain to him that I can't understand Bangla because I'm from XYZ city, he started lecturing to me about "Pol Science" and spoke to another passenger close by as if solemnly appealing to him to set me out of my errant ways.

When he left, the other passenger was just as puzzled as I was because he was there the whole time and didn't see me doing anything wrong. He reckoned I was just too polite and this guy was using me as on outlet for some second-hand rage, encouraged by the lack of retaliatory agression.

I'm a responsible citizen and pride myself on my civic sense. Never littered in my life, and I always respect elders in public transport. Here I am in another city to meet friends and distant family on earned leave from work being heckled by the subway aviator gang for a non-existent crime.

Please tell me if I was at fault here. I am assuming he thought I was leaning on the railing, which I was not, but I guess it's something he may have thought looking on from that angle. I genuinely want to know if I can be better. If you do see someone doing something irresponsible, maybe call them out on it politely? It's super inappropriate to address a stranger as “goru”, I know that much. I think we should think about how we talk to people before lecturing them on “Pol Science”.