Gotta know your audience. Are you in a dungeon/town/event chatting with randoms? Probably not the best time to be dropping fbombs. Are you chatting with your own personal group of friends/FC mates where this language is acceptable? By all means, go for it.

Much like in real life, we all have the ability to say whatever we like, but you have to use common sense and your own discretion to know when and where it is appropriate to do so.