Technofirma passive mobs attacking me on sight?

[PJSanderson]

Hey there. Having a good time so far on the server and hoping to either co-op a village or start my own settlement. I started with a cabin on the spawn island but when there was still snow on the ground in June decided I was a bit too far north...

After a couple of failed attempts (mugged by a bear and a cave spider) I am finally farther south. I am noticing now though that passive mobs are attacking me on sight.

That is not normal behavior, is it?

I suspect this will make it very difficult to domesticate them.
And even then, will they accept food from the other side of a fence?