It's not offensive but it's annoying.

I always think people who say that aren't comfortable with themselves

This right up there with "yolo" and "swag" when it comes to annoying poser thug terms. My friends say it for the stupidest things. Like how will saying "cool shoes" or as they would say it "fresh kicks" make you suddenly want dick?

Once I had sex with this guy and then afterwards he said no homo... it was obviously a joke but people need to realise that on no occasion is it okay to say it

I just feel like people who say, "no homo" often are insecure about their own sexuality.