Hmm..say it was part of a longer conversation..
Me: Jeez, I suck at staring contests <--------
Her: Who you staring at? <--------
Me: At yo butt, gurl <----------
Her: Are you trying to flirt with me? You're doing an horrible job <-----
you turned it around a bit but learn from this. don't ever tell a girl you were starring at her butt.,even if you weren't.use another one in your toolbox apart from that if you may.cause it demonstrates lower value.you could avoid that.