Opinions Please.....

I don't think you were out of line, Rob...not at all.
I just turned 67 and I can get pretty darn "grumpy" sometimes, especially with screaming, undisciplined kids.
I have a nephew & his wife that don't believe in any type of discipline of their kids.
At my mom's funeral, the oldest one, about 9 years old, was running and hollering all over the mortuary like it was a outdoor playground.
I "lost it" and had had enough. I grabbed the little snot very gently, but firmly, by the arm and told him: "you get to h out of here and don't come back in here. IF you come back in here, I'll whip your smelly little azz to within an inch of your life. Now, go cry to your mother about it." And he did...went crying to momma. They came over, mumbled about filing charges. I immediately handed them my cell phone and told em to go ahead and call the cops. They backed down after I told them exactly what was going on. But they knew what was going on and elected to not do anything about it...until I intervened. I had already talked to the staff, and IF he came back in there, the staff was going to tell all of them to leave or they were going to call the cops. Thankless and undisciplined kids get to me the most.