Tone speaks louder than the text itself. You were giving off the impression that you're just in a sour mood and being a kill joy everywhere you go (which is just a bad attitude to be going around with).
Another thing I forgot to mention is slang will throw you off a lot. All languages have slang and you really can only pick up on them with a group of friends and stuff. I had a really close friend that was fluent in Korean when I was really young and a lot of slang got into the very limit Korean vocabulary I have (I'm actually not really good at Korean, just enough to understand StarCraft stuff).