But men have that same right, so why would you question someone's decision to swear in front of ladies and under 18s but not men? It seems to me you are assuming that men are happy to listen to swearing, something that you just claimed was the height of sexism, no?
Oh, and suggesting that swearing is indicative of a poor education is, quite frankly, bollocks. It can emphasise a point expertly when time or space is at a premium.
These are all just words, part of learning the English language is learning these words and learning when and when not to use them. Using them on an internet message board is fairly inconsequential. Using them at a job interview, when meeting your partner's parents for the first time or when giving a eulogy could be quite disastrous.