I agree with the first line.
As for the second I disagree. I classify curse words as what they are, because they have inappropriate meaning, they are used in the intention to cuss, and they are often used in anger, or in insults, or in vulgar conversation. I don't think that makes them "bad," necessarily, but that does make them inappropriate.
As for the third line, let's take an easy one for example, donkey. That word isn't bad or inappropriate, but people have gradually changed the meaning of the synonym to become a curse word. It is used in the same place as curse words, it is used as having another meaning, things like that.
Who says they have "inappropriate meaning" in the first place? He's saying that you're the one who decided anger, insulting people, and vulgar conversation are inappropriate for you. You seem to be applying this personal belief to everyone, though.
Can you please explain to me how cursing shows your maturity? Because I personally don't see it.
Children in our society are misguided by their parents and most other adults into thinking that there is something wrong with saying the word "forget," among many others. As said above, people decide for themselves what a word means to them. Saying something akin to the imposed delusion ("Cussing is bad, don't say bad words!"), implies you have blindly accepted the teachings that arbitrary words are inappropriate. Even if by some chance you decided on your own that these words are inappropriate, you're likely to get caught up with the main group.
Another complication to reading people is that many people think that they're cooler if they go against their parents' verdict, whether or not they understand it. This leads to idiots who believe they are better for saying "stuff" as every other word in their sentence. They become a second group as an offshoot of the first, but usually eventually end up forming their own opinions far enough down the line. You are clearly not of this group.
Summary:
First group: Cussing is bad!!!
Second group: forget forget stuff starfish forget rooster lololol
Third group: Formed independent opinions on what should be said and when.
So to answer your question, although not a direct link to maturity, people can be judged by where they stand on the matter. If they are in group 1, since many people in that group eventually split off to form group 2 or even move directly into group 3, it often implies they are rather young. If they fit into group 2, they're just making fools of themselves. Someone in group 3 may find cursing annoying, but they won't make a big deal about it.
I promise this wasn't originally supposed to be this long.
