First prize for dumbest dude on the planet goes to .... Michael Rapaport!

Okay, you may not know who he is -- most people don't. He's a washed up "comedic" actor who decided today was a good day to make fun of Ariana Grande's appears in a ridiculous Tweet. He thinks he's being disruptive but all he's doing is showing the world what a horrible person he is AND that he has horrible grammar.

He writes, along with a throwback pic of Grande: "Ariana Grande is 27 acts 12, you take off those boots she hides her legs in, the cat eye make up and the genie pony tale and I think there’s hotter women working the counter at Starbucks no disrespect to Starbucks."

And then he goes on to plug a new project which we won't even mention here because WE'RE NOT FALLING FOR IT, RAPAPORT!

Clearly this is a BAD attempt at getting cheap PR for his new project which no one would have otherwise heard of, but we have a feeling absolutely NO ONE who cares about Ariana Grande enough to read his stupid Tweet is the kind of person who'd listen to this dude's comedy.

After a million Arianators have come to their queen's defense, Rapaport Tweeted back: " … Talk s—t about Arianna [sic] Grande & I hate Women?”

He added on his Instagram Story: “EAT Dwycks SnowFlakes. Stay Disruptive Stay Disruptive #DisruptiveBehavior @iamrapaport." SO DUMB! There's a difference between being disruptive and being mean. Ariana's going high while he goes low -- we hope she doesn't bother to respond to this mess.