Mark Richt was dismissed and he was on a 4 game winning streak including beating rivals Auburn and Georgia Tech. He was only 9-3 that year but still, there is a big difference between complaints and dismissal. UGA fans are a bit over the top.
Mark Richt had also been coaching there for 15 years. They played four teams in 2015 that won more than 7 games.
They lost to three of them and got blown out in two of them. (The other was Georgia Southern, nothing to boast about).
Richt didn't get fired because he lost to Alabama in 2012, his team was an underdog.
He got fired because:
a) he lost to Ron Zook (not Spurrier) and blew a national title shot in 2002
b) he lost to Ron Zook in 2003
c) he played two SEC opponents with 10 wins in 2004 and lost both
d) his team didn't even show up to play the 2006 Sugar Bowl against WVA, a game that built RRod's reputation beyond believability
e) he lost to both Vandy and Kentucky in 2006
f) that bush league celebration against Florida in 2007 and probably having the best team in the SEC yet didn't even make the title game
g) playing two good teams - Alabama and Florida - and getting blown off the map by both after starting the year as a title contender in 08
h) losing 9 of 15 games during a period of 2010 and 11
i) losing to Vandy in 13 and then blowing the Auburn game with defenders that enabled the Prayer at Jordan Hare
j) losing to two average SEC East teams (7 wins) each in 2014 despite probably being the best team in the division
k) not just losing to Alabama as the only favorite over the Tide but getting blown off the field in 2015
Take just two or three of those things away and - even without the national title - he's still in Athens.
Ever look at Richt's record against FBS teams with ten or more wins (e.g. pretty good to really good teams)?
Try 14-26, and one of those wins was against unbeaten Hawaii in 2007. At one point they lost 12 of 14 to good teams, and the two wins were over Hawaii and rival Ga Tech, which is about like USC beating Stanford.
What I'm saying is that Georgia fans learned over 15 years that while he was running up some pretty good numbers against the Little Sisters of the Poor that frequent the SEC East, he basically lost 2/3 of the time he played even minimally good teams.
Kirby Smart is 3-3 against ten-win plus teams, and two of those three losses are last minute losses to the national champs and a playoff team that may wind up national champs.
If Kirby can go .500 or better against really good teams, he will be there a long time.