This made me lol

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Right lets deal with the first part in bold, presuming you meant Then i'll call you a scumbag, wow thanks for that, karma is going is going to get you for that nasty insult of my character
As for your comment about foul language being used depending on the place, well it has been clearly stated it was used on a bus full of people including elderly people within a close vacinity, so why even question it, your answer is right there, UNACCEPTABLE, have respect.
As for the argument i highlighted in red, could not be less relevant if you possibly tried, thats like saying we cant dislike whale hunting, or baby seal clubbing because its accepted somewhere, do me a favour !
I have a contention about the type of person you are from what you say, you would be happy to let the whole world walk all over you, if you saw a young woman being raped you would probably walk on by, phone the police and let it happen, after all its not down to you to inflict justice on bad people is it ?
In response you will say thats an extreme example, so what? Mere shapes and sizes, in the same respect i will argue that your arguments of moral fibre and society coming to a crashing hault because a guy hasnt gone above and beyond and out of his way to return somebodys unecceserily expensive piece of technology is completely out of proportion.
End of.