I think everyone should know their limits, saying "wtf" in the context of confusion isn't bad. But if you are aiming a swear word and abusing someone directly, regardless of it is a player, coach or fellow member that is going beyond your limits and disrespectful.
I don't swear, i hate people who swear, it is disgusting tbh, discussing a matter appropriately does not require any swearing what so ever, so i don't mind it being abolished completely but it is natural for people to say wtf or bs every now and then.