Yes, members of certain groups have had a history of being treated badly because of their membership. But it seems to me that the [link|http://www.law.cornell.edu/constitution/constitution.amendmentxiv.html|14th Amendment] argues that hate-crime laws are unconstitutional.
Amendment XIV
Section 1. All persons born or naturalized in the United States, and subject to the jurisdiction thereof, are citizens of the United States and of the state wherein they reside. No state shall make or enforce any law which shall abridge the privileges or immunities of citizens of the United States; nor shall any state deprive any person of life, liberty, or property, without due process of law; nor deny to any person within its jurisdiction the equal protection of the laws.
[...]
But I'm sure there are arguments that say that h-c laws don't violate this amendment.
Cheers,
Scott.