Kitty has obviously never seen stormtroopers trying to shoot things. Those guys can fire round after round without hitting a damn thing. Her method looks elegant by comparison, so yes, the compliment is warranted.

He's not sure what his range is, either, since distance isn't something a person has to go for when throwing things and people around on starships. It does exceed blaster range, so he brings the two rocks that get away flying back towards them.