Oddly enough, although not OFFENDED, I really hate the way Americans celebrate St. Patrick's Day, and I'm 100% Irish-American. I just think it's repulsive and insulting to celebrate Irishness by getting falling-down puking drunk (it's gross to celebrate anything by doing that). Sadly, it's often Irish Americans who are the worst offenders, so I doubt you'll see any protests soon. I just hate it myself, is all.
Having said that, I must say one of the best parties I ever attended was a "Alamo" party - come as a cowboy, Mexican, or Indian. Great Tex-Mex food, great drinks. And the only people who should be offended should be Texans (since they lost).
I think it's a fine line between stereotyping ("ghetto parties", "pimps & hos", anything with blackface, references to drunken Indians/Mexican/etc.) and celebrating (Tex-Mex food and Margeritas, hip-hop music and costumes, ethnic costumes and decorations). Celebrations are great, stereotyping can be hurtful.
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