Personal attacks are never okay, however I'm not surprised this is happening considering the level of rage people are feeling about the development of this game right now. The fact that the devs have to go on twitter and act as if the game is the perfect gift doesn't really help the issue. Someone on twitter is gonna have a miserable day and then take it out on poor schmuck of a developer and boom - you get this toxic bomb going off in all directions.
Also I think that Maxis and the devs are being too sensitive in certain aspects and then the angry toxic mob gets even more riled up. The simmers that 'defend' the devs aren't really helping either, becoming just as toxic as the angry mob.
What would help is if people would be able to calmly state their opinions and feedback on the packs and the game without getting jumped by either SimGurus or other simmers. Some simmers feel a certain kind of way right now, and they have the right to. This 'stop being mean to the devs' culture only breeds toxicity, that's the truth.