nudist beach masturbator

I was at the beach,a little nudist beach,and there was me and othe guy in his forties or fifties,i talked to him and the conversation turned on and he started to masturbate in fron of me,he said i should try to and i touched a little and then he tried to touch me but i didnt let him,one thing is just masturbating in front of others and the other is mutual masturbation and i didnt want it.