Hmm... On the one hand, there's nothing wrong with having fun. But on the other hand, many people can't tell the difference between "fake GLOs" and "real GLOs".
You have fraternities and sororities - national, regional, and local - that promote their members' academic achievements, do philanthropy work, have meaningful rituals, etc. Then you have groups of men or women who get together one day and declare "We are now Alpha Beta Gamma Fraternity" and do nothing but wear letters and party.
People see the ABG's going out and getting plastered every night, see no sign of community service or academic programming on ABG's part, and think partying is all that greek life is about.
On a separate note, there are plenty of people out there, including some greeks, who think that local GLOs are "fake" just because they're locals. I was a member of a local and was on the receiving end of this attitude.

We were brand new, much smaller than the national chapters, did not participate in formal rush, and didn't have the name recognition that the nationals had... BUT we consistently exceeded all-sorority GPA and pulled off a major fundraising event on the same scale as the other sororities'. I'd say that made us a real sorority
I point out that every national GLO started with just one chapter!