a) Booster was using the JLA teleportation system (without permission, of course) as part of his latest business venture; an instantaneous package delivery service.
b) Said delivery service accidentally teleported a large number of angry armed men into Kyle's apartment, which he had to deal with without the whole secret identity being exposed.
c) Said delivery service was also being used by an intergalactic Kingpin-analog, who was using Booster's business to facilitate his intergalactic slave-trading operation.
So yeah... TOTALLY think Kyle is justified in being annoyed at this point.