I have a friend attending yet another UMC in a nearby town where there are bitter feelings between those attending the traditional service and the contemporary service. It has played out in an interesting way around the concept of sacred space. The traditionalists view the church's sanctuary as sacred space requiring a certain standard of reverence not embraced by the contemporaries, who dare to bring coffee cups into worship and drink throughout their service. Unfortunately, the contemporary service is the early service so when the traditionalists enter there are dirty coffee cups left in the sanctuary which infuriates the traditionalists.
I have been told there is also a significant disparity between the groups in level of financial support of the church, which irritates my traditionalist friend. I suspect that is a matter of age demographic in that older people who are better off in life economically may also lean toward the traditional service. Just speculation on my part though.
Lesson: If you are going to have both types of services, perhaps its better to have the traditional service first to avoid the coffee spat?