OK so let me explain Hanachan: As you may or may not have noticed, usually in the 48 groups, whenever a new generation joins - this is also from 1st gen as well - there's always a couple girls that sticks out naturally. With the 2nd generation draft girls in HKT48, all three girls were and are unique and interesting, but it was Hanachan that had luck with TV shows, managing to make a name for herself. Something that is often overlooked, is the effect TV shows has on girls.
For example, Goto found Hanachan to be very interesting, and so he shouted her nickname on the TV show he hosts. That a host does this was pretty hilarious and both Sasshii and him laughed over this. Fans found it funny too, and then as small memes usually are repeated, this happened again a few times. Hanachan of course being aware of this utilized it well by playing to it. She's got an extrovert happy personality and knows and understands TV well and how to act behind a camera. This is very helpful to her. This functioned as the little snowball that runs off the side of a mountain, and becomes a huge ball of snow rolling down the hill.
Now this isn't the only reason why she's popular (the meme thing) but it's part of it, because it helped people notice her. She's popular in handshake events too, she's pretty, extrovert, well-spoken, and so on. These are all good factors for being a push candidate. And the push she has received, and it's working.
So, every generation will have someone be pushed regardless of how many other fresh faces a group has.
What's great about HKT48 is that they are still open to letting other girls get senbatsu chance (see Yuriya and Yuutan as recent examples for this).
You should not be irritated at all about Hanachan. Be irritated about Paruru and Annin instead. That makes more sense.