Sometimes I think that God lets us experience things at mass that we don't want to so we can learn that these are beloved of him, too...even fussy kids, or people who wear clothes they really ought not, or the ugly or handicapped, or even those who chatter when they ought to be quiet.
I did once fuss at someone though, when the boyfriend (who I suspect was not catholic) of a girl sitting behind me was teasing her about going up to communion so he could have some wine. They had been chattering softly throughout the mass, but that one just got on my last nerve, and as I got up to get into the communion line, I said, "Shame on you!" and they were relatively quiet to the end of the service.
Disrespecting Jesus at that sacred moment was just more than I could deal with!