[Erik P Conard]

English is constantly in change. The language has undergone a
lot of change thru radio and standardization of certain words. The
campi one I had never heard of as pretentious but sometimes used instead of campuses. I use both. I have studied Latin and
have a good romance language background. There are a goodly
number of English words from Latin and we constantly mix up the
singular with the plural...like criterion, criteria; datum, data, and
so on. However, the usage of the Latin amongst educated folk
may not necessarily be "elitist," or "snobbish" and frequently the
critics of such have unlikely darkened a foreign language classroom. We go to college to somewhat upgrade ourselves,
and if that be objectionable, take a look at yourself.
Campuses and campi are both acceptable, in my opinion. But if
you do not understand the differences, don't use 'em, hoss.