I agree with a lot of the other members. Also, imagine if people did 'find' these indicators in his chart, I can't see a good way of approaching him on this, 'these people say you're chart is gay, so are you?' I don't think you mean any harm, I appreciate you say he's your friend, so I'll give you the benefit of the doubt.
To reply directly to your question, I'd say: leave the chart and consider talking to him. Summon your warmest, non-judging and affectionate self, apply good listening ears and have a chat with him. Let him know you're available to talk about these 'rumours' if he wishes. Whether 'true' or not that he will always have a friend in you, and perhaps in that he is your friend, you kind of want to stand side by side with him when someone talks about your friend like that.
p.s. note that it is hard as he## growing up gay even in 'modern' places. 'The nail that sticks out ALWAYS gets hammered', especially with youngest people. Consider now the pressures and criticism he faces, no one likes this. He really needs his friends now.