I also make sure to keep an even kilter unless someone gives me reason not to.
I am coming from a coaches perspective as I have done that a lot longer than I umped. I was always shocked how quickly umps jumped down my throat with no provocation. Just a simple question about what they saw regarding a ruling like IFF or a rule interpretation. Even approaching calmly and they were already starting at me very confrontational. I understood it a lot more after having gone through the local ump training. That is what they were being told to do.
So I always tried to be up front to coaches at the pre-game meeting. I owned up when I missed a call (even if I couldn't/didn't change it). I am human I got judgement calls wrong. I told them I was erroring on the side of strikes and outs to keep things moving (nothing like a walk fest in LL). I told them to make sure their teams knew to swing the bats because I had a big zone. Games went very smooth with that up front discussion.
As a coach the only thing that irked me about an umpire was when they didn't know the rules (like calling a bunt an IFF). I tried not to discuss pure judgement calls (balls/strikes/close tag out plays - especially at 2nd base with only a plate ump). Because of that I tried to let coaches know how I was calling those things (ball beating runner and tag down at 2B is gonna be an out 9 times out of 10 because I really can't see if the tag was missed by an inch from that far away). Coaches were good with that and didn't argue much when it was presented that way.
Overall reasonable discussion and attitude helps with everything and the fans generally will follow a coach's footsteps with regards to attitude. I also tried to convey that to coaches at the up front meeting as well. And that helped. Also joking with parents between innings worked to diffuse things as well. If they see you as a person and likable they aren't as bitchy. hahahaha