This is very common down in microstakes...I honestly think he's simply overvaluing his hand: a dominated ten and did a poor job of building a pot that he wanted to go all-in on (and for some odd reason feels shoving on the river is the right way to do it). He MAY have T9...but that's a chance I would take. I'd call this and be sick to my stomach when I see T9 flipped...or when I see the pure garbage he spewed on the table.