How does one handle immature childish petty actions from very long time friends? I'm really sort of fed up with them, but at one level I value their friendship. But not sure they value mine.

Petty people are not a good thing. I had some long time friends and a few of them acted up beyond my comfort level. I noticed the petty behavior from them afer I finished school, got a decent career and especially after bought my place. Mind you I was the poor one from the group prior. Perhaps you matured at a faster level then they have? Minmize the relationship and move on to stay mentally healthy. We all know people change at their own pace. Sometimes friends are like leaves on a tree they sprout, mature and then fall off. Some people want to keep you down or have some control issues, don't let them.