He probably didnt know it was his sister...he got caught slippin so an "L" he took..
lol @ the thought process "you dont disrespect another man sister" etc....many if not all of you on the siccness do it all the time....that chick you just busted in her face or called her a ho, etc...she is someone's daughter, niece, sister, mother, etc...
The real moral to this story is, dont disrespect a mans sister WHILE her brother is in the house with you...lol...If you dont know everyone in the house personally, then find out who these mf's are before you start talking s--t...You just never know who is connected these days..
You know whats weak these days? You cant get caught slippin EVER because SOMEONE will bust out their camera phone and it will be on youtube in days....times have changed....lol