Blocking the path is rude.

I am not saying horn should be your #1 signalling device, but when a bunch of *****holes take up the whole path and refuse to move after you ring the bell or say something, then a horn is very justified.

In fact, taking up the whole path is very inconsiderate even if you do move after you hear the bell. But I'll still use a bell on such a group first. Cause I'm a nice girl.