Potty mouth

Ryan has a potty mouth.  And I'm not too bothered by it.  Is that so wrong?  He knows what words bother me and he doesn't say those in front of me.  But others like the S word or the D word or the B word...those don't really bother me.  Most parents would freak out.  Not me.  He self censors and is sure not to say those words in front of people he shouldn't.  I know other parents would be freaked out at this and probably call me a bad parent.  But...I'm just not bothered by it.