the wrong things to say

i just realised my bro has started to become rather vulgar these few days, spewing vulgarities like nobody's business. and right infront of people's faces sometimes. he just scolded 'what the fuck' at me. i'm quite mad at him, though i didn't raise my voice at him whatsoever. i just asked him...

"do you have to be so vulgar?"
he rolled his eyes.
i gave a cold hard glare.
apparently, he said, "stop giving me that stupid look of yours."
i felt disgusted and continued the glare.
he looked away, pissed, for a while...
then turn back and gave me the big broad "i'm just joking" grin.

he's becoming more rude. but still, he's still a 15 year old; childish and playful. and i know he meant no harm. i guess i just have to constantly tame him. i don't care what he says outside, but at least when he's at home, he should be mindful about rude remarks like vulgarities.

i think that's the basic respect one should give to his family members.