I disagree with this statement 100%.
No problem.
I see no evidence of that kind of character favoritism anywhere in Whedon's work.
I stated two examples in the same post you're quoting.
I see no evidence that he's refused to acknowledge Hank Pym's importance.
I see it everywhere. He refuses to acknowledge the fact that Hank Pym is one of the most important Avengers...arguably the most important after the Big Three (Cap, Tony, Thor). Not wanting to use him is one thing, but pretending as if he isn't important is a whole different thing. His initial "beef" with Marvel for not letting him put Wasp in the first Avengers film also makes him come off as hypocritical, since Janet is apparently an important founding member but Hank isn't.
....or replacing Hank Pym with a different character in the adaptation of Ultron's origin story constitutes crapping all over the character.
Continuing what I wrote above...
Removing Ultron from Hank is like removing Hank's strongest character arc from Hank. Ultron is the reason why Hank considered himself a failure, why his marriage failed, why he always tries his best (as a way of atoning for his biggest mistake), etc. In return, Ultron himself is also heavily influenced by Hank and plays into the whole family dynamic, with Ultron considering him his father. Hank/Janet/Ultron are essentially a dysfunctional family.
With that taken away from him and his founding member status taken away and a lot of the roles he plays in the team being taken away and with him being brought in so late into the game, what reason is there to care for this Hank Pym if he's been "robbed" of everything? Will Hank fully still be who he is after all that? Will he be as interesting to watch as he would have been in the beginning, had he not lost all the previously stated things in the first place?
and I see no evidence that Geoff Johns is a talented writer.
I won't lie that I laughed at this.

In a way, I actually agree with you. I was specifically talking about his writing on the characters he really likes. I think Johns is good at writing his "pet characters" (Flash, Green Lantern, maybe Aquaman, and maybe one more). As in, the solo books of the characters he loves more than anything else. When it comes to any other character though...yeah. Batman especially should be kept as far away from Geoff Johns' writing as possible. Heck, further than even that.

t: