I don't think I would have dinged the guy for speaking English poorly. After all, he's a Latvian immigrant. Also, I don't think it's a breach of etiquette for him offering to do a post-mortem with you. I doubt if his intent was to offend you.
He wasn't an immigrant, like me he just came to participate in the tournament. I told him 'No, thank you' and well I did point out that he probably didn't mean it in a bad way; in fact I did so directly after the bolded part.
It happened to me but it wasn't just because I lost the first (and so also the last) game in the tournament. I didn't like the playing hall - it was far from the centre of the city - with its plastic seats and tables; I was basically too tall for them and couldn't comfortably place my arms. I couldn't concentrate at all and lost with the White pieces in like 14 moves in a Scandinavian (that's quite an achievement) versus a Latvian player rated like 250 points higher than me. He then signed my scoresheet, which is common practice but this time we were given a separate result card, and asked me in awful English if I wanted to analyse the game. To be honest it's etiquette not to ask that if you just had a game like that, but oh well I guess he didn't mean any harm. I went back to my hotel room and withdrew, then spent the remaining days sightseeing the city.
No one ever withdrew directly after playing me.
I don't think I would have dinged the guy for speaking English poorly. After all, he's a Latvian immigrant. Also, I don't think it's a breach of etiquette for him offering to do a post-mortem with you. I doubt if his intent was to offend you.