I know. Pretty inconsiderate, if you ask me. On one of the boards I used to run we had a rule specifically against using languages that the majority of members couldn't understand, including "1337" (
leetspeak). If you absolutely can't communicate in English, stay off English-speaking boards. I mean, difficulty is one thing if it's not a native language, and that's understandable. But to deliberately change languages so nobody can understand you is just uncalled-for. Most boards have Private Messaging capability. Use that if you want to indulge your yourself.