Headscratchers / Crash Team Racing

• Why did the forces of Earth not simply combine to defeat Oxide, who had arrived by himself and who, it is implied, is acting of his only volition and not likely to be able to summon any reinforcements?
• In CTR, one of Oxide's taunts is to say "You're slower than a [what he says here is unclear]." What is he supposed to be saying?
  • Oxide's taunt in question is "You're slower than a boat, you human scagwart!"