I already disliked Daenerys but the dragon battle just made me despise her more.
I'd be interested to know if it's just my bias that coloured my perception of the battle, but it seemed to me liked it was intended to make you side against her.
Yeah that's it. What did the Lannister's do to even deserve that level of vindictiveness? They came to Highgarden to sort some stuff out (people say there was a battle, but I didn't see one). Afterwards Jaime had wine with Lady Olenna where he explained that they needed some of her gold and food to help pay debts and feed KL, to which she surprisingly agreed to donate all of it to the Queen. How generous. She even offered to give her entire region to one of her most loyal bannermen, and Jaime didn't even ask her to do that. Wow.
Then as the march back to the capital was happening, the lads started to get tired and the honourable Randall Tarly suggested a few moral boasting excercises to get things sped up. A bunch of merry boys, adventuring and having fun. Until that wicked, dragon riding, she monster decided to swoop in and destroy everything. Gosh what a villain. A battlefield should be a sacred place where blood should never be spilled. Lannister enemies should of course be rooted out and destroyed in every manner and fashion imaginable. But to strike at the armies of the golden lion? That's a war crime of despicable levels.