"Problematic" is when something doesn't perfectly fit your values. As soon as SU becomes problematic in the right person's eyes, they'll make a post & it will spread & there goes the neighborhood.
What's awful about tumblr's climate is that most who are using it take th posts as fact. Then in real life, they will cite tumblr posts as fact.
"Why don't you like SU any more? You forced me to watch a whole season!"
"The creators are problematic, and we're intentionally queerbating

, and hate their fans

"
"Huh? What? Where'd you read that?"
"I don't remember. I just remember it being all over for a while"
I understand their thought there, like if all the people they are following reblog something they can't all be wrong.... But, the whole following system puts you in a bubble and you only hear what's being told to you & can't see the whole picture.
TDLR: I remember there was a big drop in viewership/creation in MLP related blogs because they were ashamed of being associated with the drama caused by DD and Pinkie, it got way too big way to quick. The moderates left as soon as possible, leaving the crazies on both sides.
I imagine there will be the same sort of thing with SU... they just need a spokesman & circulate their opinions, before the moderates decide that it isn't worth the drama & stop blogging/watching the show.