How come my friend told me not to say sugio because i'm a guy?

Question:

i am gay so....i can get away with things like that;
but either way he said it's "customary" to say something else (forgot the word its sooo uncute)

Answer:

I have no idea why your friend told you so.

Sugoi is just one word. And it's nothing to do with your sexuality whether you use it.

He may have told you that you should speak in more feminine way. But in fact, sugoi is an unisex word used by both men and women.