Yeah, that's a massive red flag for me if you misunderstand a clear-cut arc that the original show portrayed as being clearly bad. Depicting something does not mean it's endorsing it. Sokka's sexism arc not only was about humbling him to recognize that women could be capable and powerful warriors, but also relayed something regarding how he felt he had to be "the man" of the tribe at such a young age after all the other men and his dad had left for war, and was indicative of the overall patriarchal society of both Water Tribes as well. This is especially focused on in the Northern Water Tribe arc with Katara, Pakku and Yue.
Without it, you take away important character development and worldbuilding. How the heck is his relationship with Suki going to develop now and how are they going to portray the Northern Water Tribe arc if they're severely toning down the sexism? In an attempt to sanitize this for no good reason, they're making this version less progressive than the original show.
I feel like I'm starting to understand why Bryan Konietzko and Michael Dante DiMartino might have walked.