Dealing with lower level coaches?

[GFS-1]

I've been officiating for 8 yrs now, still a rookie in my Assoc.
Why is it the lower level Coaches Freshman & JV scream and yell at the officials for calls or no calls. I sometimes stick around for the varsity game and the Coaches for the most part just calmly ask questions about calls. I feel the lower level coaches just want to win the game as most do, but keep there job to make that extra money coaching? Do you lower level officials see this as well? Hope everyone's season is going well. GFS-1