There is absolutely nothing wrong with asking a man, if he is a Mason. I was intrigued by Masonry, and I asked a man about it. He gave me some answers, and soon I was asking for a petition. As I progressed through the degrees, I learned more ways to identify a Mason. After 28 years in the Craft, I am still learning more about Masonry. I am confident, that you will, too.
And it is perfectly permissible, to discuss Masonry, with other people who make inquiries. Maybe you will peak their interest, and they will ask you for a petition.