I often wonder how funny we must seem to Japanese 
natives who visit our boards or recieve e-mails 
from us.  I have a classmate at my martial arts 
school who laughs at my mis-pronounciation of 
various Japanese words all the time- he has been 
living in Japan for the last year.
However, ENJ, think about this- Japanese people, 
at least characters in anime, use lots of English 
words.  How many times have I heard "Lucky!" 
or "Hello!" ?  There are lots of other words too, 
but it's very common to hear English, single 
words or phrases in an anime conversation or J-
Pop song.  I think it is for the same reason- 
each culture thinks something about the other is 
cool, and so they mix in a few words, even if it 
might sound silly to the native.
I do not make fun of the grammer or spelling of 
Japanese people who post or write e-mails, and so 
I think it is nice for them not to make fun of 
us. Incidentally I don't refer to myself as chan, 
kun, san, sama, sempai, etc....