How do you refer troublesome man?

A troublesome man can be referred to as a "troublemaker," "nuisance," or "difficult individual." These terms convey the idea that the person creates challenges or disturbances in various situations. Depending on the context, you might also use more specific descriptors, such as "disruptive" or "contentious." Ultimately, the choice of term will depend on the severity and nature of the trouble caused.