You play all day

Acting as if you didn't (or don't know) know what the outcome of your actions, a comment, statement, etc. would be; acting unaware

During a conversation....

Person A: **sarcastic tone** "How was I supposed to know she didn't know her dude was cheating on her. He always bragging that his DM be poppin..."

Person B: "You so petty...You play all day!"