That's fair. If everyone is getting them but you, that's not right. Next time just argue that a shortbow is a halfling longbow.
There's more to it than that. The fire giant has 2 attacks at +11 that deal 6d6+7 damage, while the glabrezu has 2 at +9 for 2d10+5,and 2 at +9 for 2d4+2. The giant is going to hit more often for significantly more damage. The pincers do have a grapple, but that ties up the grappler as well, so it's not fantastic. The giant also has a ranged attack that does 4d10+7. The glabrezu some spells, including confusion and power word stun 1xday.
Those seem pretty fairly balanced to me. Much more damage and no resistance, vs. much less damage and resistance.