fact-diss

to diss someone's fact or diss them with a fact of your own

fact-diss 1
person one: he's the greatest footballer of all time, he kicked 1226 goals
person two: as a matter of fact it was only 1126

fact-diss 2
person one: i think he was with sharon last night, maybe somethings going on
person two: sharon was with me last night, idiot