Did I watch the same episode or are people really hating Iris for trying to work through some complex emotions?
She didn't even directly throw Barry under the bus, either. Her only crime was that she just screwed up trying to cover for his bizarre behavior.
Like I said during the episode, this is what she did:
me said:
"I'm not saying dude's a virgin, but I never seen him get laid while he was thirsting after me."
Some friend.
There are MUCH better ways to explain your best friend's social awkwardness than implying that he sucks with girls because he's still in love with you. As goofy as Barry was around Iris pre midseason, he at least made the effort to become friends with Eddie, be open with Iris about his feelings, distance himself from Iris when it became too awkward for both of them...he even helped her move into her BFs place.
The show has run into the same problem (as someone mentioned above) that other superhero shows have. They've written the inevitable love interest as needlessly tsundere to justify the main character not being with them for the first few seasons, and it comes at the expense of the audience noticing, "wait, why is he pining after this girl when there are 4 other girls just as hot in this show that want him badly and clearly get along with him so much better?"
Chloe vs Lana Lang was the worst example of this, with Felicity vs Laurel coming pretty close.
Contrast this to something like The Spectacular Spider-Man, where the main character doesn't realize that "the one" is best for him, because he's a stupid teenager who's goal in life is to date a cheerleader or a model.
So now we have Iris, who got along just fine while Barry was in a coma, and whom we've already seen is quite happy in her current relationship with Eddie who is actually a great guy, creating drama for no other reason than Barry + Iris has to be a thing.