Men get bashed or arrested everyday while cruising for sex. Finding the balance is the key and that takes experience. It might be helpful to know that most of the men you encounter in a theatre, park or toilet are likely as apprehensive as you are. If they stroke their cock in response that is a clear signal. Small talk, while often called upon by men to help them relax, is rarely appropriate in sex environments.
Guys are normally silent for the most part, walking around checking each other out.
If you encounter a friend, acknowledge them, but for gosh sake don't start gossiping. The silence, perhaps broken by the moans of sex, are part of the atmosphere. Chatter has no place in this scene. Older men, in particular, have a problem way too often at taking a negative response from a young guy. Be respectful of the men you encounter.