That level of "toxicity" where some peps get flamed on streams you will see in every gaming community. If you put out your performance publicly, be prepared to be judged, and not necessarily in a constructive way. It's not something that I endorse, don't get me wrong, but you do find that attitude in any gaming community.
Related to NiM community not being helpful, I strongly disagree. Did you reach out to teams that cleared it and you didn't get any help? Every time I've asked directly players from FC, LSD, Mangos, and many others that cleared fights before us, beside providing complete feedback, with detailed tips on certain classes they also offered direct assistance with joining the runs if/when we needed.
That statement is BS.