just got super pissed my ex little sister is like my little sister to me, and her mom just came to…

just got super pissed my ex little sister is like my little sister to me, and her mom just came to me like a real bitch saying I NEED to reply to my sister text, first of am I'm at work so if I don't reply and don't come to me being rude on my Facebook telling me what I need to do, now I feel like being petty and not responding I'm 25 years old i.will reply when I get ready too!