Hmm, thats hard to say. Mainly, over usage of Singlish makes me
feel like the other person is a gal. Also the words that are used
will make the language sound either feminine or masculine.. Like
for example usage of "leh", "lah", "meh", "mah" etc will determine
what the sentence sounds like and the reader begins to imagine that
the other person is a female if there are too many "lehs" or things
like that..
Haha complicated.. I am not sure how to explain too. Best though is
skip Singlish completely when typing in forums. Thats what I do.
Helps you improve your English too =)