I think the backlash is enough as a punishment. Reducing the episode order would just unfairly punish everyone else on that show as well, as it means less work for them. The best way forward is to keep a minder on him for all public interactions in the future to keep this from happening again. That minder would probably have his/her hand full if all the sources saying that he has an "ego" and "sense of entitlement" are true.
While it was refreshing to see someone being brutally honest, I felt that Noah should not have dragged other people into it. The Colton Haynes comment was especially uncalled for. While I thought that Colton being gay is basically an open secret and him waiting so long to announce it is disappointing, it still doesn't make it right to attack him for it. Especially since all LGBT people have their own process/journey to coming out.
I thought the Eric Stonestreet was a bit like pot calling the kettle black. I find Kenny's character to be a bit of a caricature too, so it was weird that he would comment on Eric like that.
The Singer comment... probably a better way of wording it without getting into slander territory. There were many ways he could have commented on being gay in Hollywood without mentioning any names. Considering how new he is to the industry, I am surprised that his agent didn't sit in to keep the interview from going out of control. With this interview, I think he burned up a lot of the good will he got from playing such a trailblazing role.
I agree that the Colton comment was rude, but it's totally true that the recognition a gay actor who is open from the beginning it's totally different at what an actor who comes out after years in the business, no matter if he denies being gay or blatantly lie about it. It's true that Colton never did that, but it's true too that his agent threatened to sue anybody who post Colton's pics in that famous magazine (they weren't even private pics), which is frankly not gay friendly at all.
I don't agree with your comparission with Eric Stonestreet, when i watch Eric what i see is an straight man faking what he thinks a gay man is. I didn't get that vibe from Noah's performance at all. I was always very surprised Stonestreet get more recognition than Ferguson when in my opinion Fergurson performance is way superior, but we still live in a world were a straight actor is called brave for playing a gay role, no matter how little risky (and Modern family is not exactly risky or edgy) is.
In my opinion the backlash about what he said was totally out of proportion. As i say Colton was not the best example, but we have plenty coming outs that are quite dubious, not everybody can come out in a selfless and self aware way like Charlie Carver did, and i understand that coming out in a magazine gives you at least a little control on the process, but there are a lot of coming outs when your career is on the rock bottom and looks like a way to get back into the spotlight. On the other hand what he said about Singer is what most people think, about him and a lot of people like him (and even when is a gay producer or film maker it receives more attention, the truth is that situation is way worse for young girls trying to make it in Hollywood).
I heard a lot of way worse things from straight actors and the backlash was practically zero, but with him there were a lot of people (including gay people) asking for the show being cancelled and him being fired, which it was ridiculous