Depending on who you ask, the line dividing Greek life and independent life is either one not to be crossed or one easily crossed. Students are generally welcome to most Greek events (and many attend when they are looking for a reliable and satisfying party), but the existence of Greek-only functions, those closed to the rest of campus, creates a troublesome stigma among Greeks and non-Greeks. This provides the source of complaints that Greeks only socialize internally, but others prefer this set-up. Students complain about how Greeks operate, whether it's the themes of their parties or how they segregate themselves, but students certainly cannot deny that the Greeks are always good for social events.
Yes, it can be frustrating to lose touch with friends who go Greek or stay independent, particularly because this does tend to set up how and with whom students socialize after their first year. Overall, Greek life annoys independent students, while independents are, in essence, a group of whiners against the Greeks, creating a campus fissure. However, for every group of students who fit into this stereotype, there are a few who go out and do something about it by socializing with everyone without holding grudges.