I think this is just initial hardship ones has to accept. And you don’t really need people correcting you all the time (it even bad thing since it will for sure discourage you from making attempts) since the fact somebody can’t get what you just tried to say is strong enough indicator that something is off.
You guys all speak english and has been to countries with English as main language so you know this. There is a lot of people just starting with really really poor english or with no English at all and they are making huge progress just by trying to communicate. Sure thing: they will not master the language without some extra work at home to add structure to what they say, but for sure will improve over time.
I was that guy on forums trying to write with early versions of google translator and my wild imagination how english should look like, and in no time I was able to just speak what I want to. In no time Polish disappear from my mind when I write or speak English.
Have there been rude people? yes, most of them at first. But who cares? A few polite ones was enough to start.
Japanese people can’t be more rude than people from US. I will not believe that.