Cinco de Mayo in the Gateway

I live in a neighborhood commercially known as “The Gateway” (read government supported gentrification) although I prefer calling it by the more historical name Weinland Park.

While walking home from the gym last night I saw this advertisement:

Cinco de Mayo at Gateway

I did check out the website and the “events and specials” seem to be discounts on alcohol at two bars, the “Irish” one and the “Mexican” one (Kildare’s and Made Mex).  Which to me is personally interesting because an Irish friend visiting the US called me a couple days ago and asked what this Cinco de Mayo thing was all about.  I told her it was an annoying holiday only celebrated in the US.  I compared it to St. Paddy’s but the difference being in Ireland people have actually heard of St Patrick’s day.

My Mexican aunt who first witnessed cinco de mayo a few years ago, asked me why all the college students were sitting in their yards drinking beers while wearing sombreros.  How would you answer that one?   Anyway, back to the advertisement,  I am offended by it but am having difficulty articulating why, and was hoping my readers could help me out.  On a positive note, it is less offensive than the “spicy” one the North Market had a few years ago:
Cinco D' Ohio