I think there is many sides to this.

1st The guy has some balls.He wrote he name down.

2nd If the deer cross 20 yards from your truck.I would not park there.

3rd I dont walk in on deer trails at all.I normaly take the least used[by the deer]way in.

4th The guy that drives less than 50 yards from your friends stand sucks.I would move my stand,or would have never put it in a spot where ANY one could drive by.

I do however think any one that puts a stand up close to some one elses stand is not much of a hunter.I would leave my stand there,hope that he hunts it the same day I do,Than I would stand up in my stand and PEE in his direction.I bet he would never put a stand around you.