Wanna know the real kicker? The previous episode gave us exactly the reason why Gilda was so rude and angry with Pinkie way back in Season 1. In fact both Gilda and Discord last ep shared so much in common.
 
Both Discord and Gilda had no friends in their lives. Discord being a villains and god of chaos. Gilda being dirt poor and stuck in a dump with surly greedy griffons.
 
Their first friends were ponies that stood up for them. Discord with Fluttershy and Gilda with Dash. Both formed deep bonds with them as they were their very first friends period.
 
Both took their friendships with those ponies as to put them on a pedestal. Therefore whenever anyone comes into the picture to, in their own minds, take them away (Pinkie Pie & Tree Hugger respectively), they act out of pure jealousy. Since they don’t have any other “special friends”, they act in a very protective sense.
 
The differences of course is that Discord was reformed much more earlier so some of his malice was absent while Gilda was forced to return to her ghetto where she was further molded into jerkassery and cynicism surrounded by the other griffons. Discord acted in a passive-agressive, “I’m better than you” attitude while Gilda simply was mean-spirited and rude. Not to mention when Fluttershy stood up to Discord for not accepting Tree Hugger, she basically chided him like a mother does to a child.
 
When Dash stood up to Gilda for not accepting Pinkie, she wasn’t as motherly and flat-out told her off given her tough attitude. To Gilda that was an ultimate betrayal and broke her in many ways. Naturally she maintained her cool around the ponies, but I can only imagine once she got home she broke down in tears losing Dash followed by angrily destroying her room, cursing the ponies.
 
Harsher in Hindsight.

The worst jerks are ones you can understand.

It’s the same problem that was with Trixie and Magic Duel. Seeing this episode, it just made us realize that their lives were completely and utterly terrible. Granted Trixie’s terrible life came after, it kind of puts things into perspective. At this rate we’re going to see Lightning Dust as a depressed, homeless, construction worker or something.

Being down on your luck isn’t a free pass. So I wouldn’t say Gilda did nothing wrong. Though this episode could easily explain a lot.

Well…crap