every starbucks i've been in has a tip jar.....its the jar next to the register....with cash in it.....but thats besides the point

heres what i am trying to ask. i am not bosnian so i dont know much about bosnian culture. but i do know that some cultures dont accept tips while others expect them. leaving a 50% tip seems retarded, leaving a 50cent tip to a grown ass man seems silly, and leaving no tip seems dick. i want to know if i should tip a grown bosnian man if all i order is a coffee