Your neighbor is technically wrong but you just got the benefit of 2" more area on your side. If his footings are somehow interrupting your use of your property, you may be able to require him to move the fence. Is that what you want? Sounds more like he's reacting to your position more than anything else. Fences are not cheap and he may just be angry about what may appear to him to be a threat even though it's very likely his contractor's fault, but ten to one the contractor's been paid in full and is gone. And if he has a survey showing the footings are inside his property, you may actually be getting more area of use.
B/3
Footings will differ based upon the type of project. Most footings, if building a deck for example, should be about six feet apart.
It is a foot to the second power
Isolated footings are constructed invidually & Mat foundation is making of mat and connecting all footings with this mat
It is recommended that footings in the Wisconsin area be 48" for most buildings. This is because of the deep frost that can occur in harsh Wisconsin winters.
Footings, the concrete pads upon which foundation walls are built, must be located beneath the frost line in order to prevent a building from heaving when the ground freezes. If the site is sloped maintaining a constant elevation for the footings would either cause the footings to be above the frost line or significantly deeper than the frost line at one end of the building. Stepping the footings enables them to follow the slope of the site and remain below the frost line without going too deep under the ground. It allows the foundation wall heights to be minimized because the footings are kept as close to the surface as possible.
If you mean stepped footings this is used if the structure is being built on a hill / slope. I stay in Scotland some of terms in construction can be different
foundation reinforcement
Bldg code requirements vary with locale.
connecting between footings
under reamed piles
This would be calculated by how much weight is above the footings.