When I think of blasphemy, I generally think of "don't take the Lord's name in vain".

In other words, don't swear stating - "Jesus Christ" or "God"

Yet, per wiki, it is Blasphemy is irreverence^[1] toward believed holy personages, religious artifacts, customs, and beliefs.

Per Webster's dictionary it is :

 I took the bus home today (as a Uni student with no drivers license as of yet, public transit is my primary method of transport), and sat in front of four rather talkative young people.

I myself am one such "young person" - for those who've seen my profile, the 18-29 range - and I consider myself mature and considerate. So I was sitting there, listening to my music (one song, over and over, in preparation for an English course assignment), and even with it fairly loud, I could still hear the constant swearing of the young man behind me.