This is Malcolm Urquhart. He is a bastard when he's barely trying, and he makes adults cry when he's putting forth effort. If you don't have a use to him, he doesn't like you...unless you're an absolute 10, but even then, your rack really must be excellent and your lineage flawless. (Though he's a male, so he'll almost always make exceptions, especially for modelesque half-bloods.)
Malcolm needs people to inflict his charming personality on, so please, won't you let him? If you're Pucey or Montague, Malcolm thinks you hung the moon. He enjoys Flint on a rather base level and though he thinks Malfoy is a sniveling little puke, he kisses his arse because it's the proper thing to do to the son of Lucius Malfoy.
(And Malcolm has a really squishy underbelly, so he also needs someone to poke him in it and mess with his head.)