However I wasn't upset by the planet's [Romulus'] destruction. Why? Well, I liked STXI, ...
I rest my case.
Isn't that what this is all about? That the STXI-haters are upset that JJ's film somehow affected their beloved Trek?
Sure, but the interesting point is that since they (We! Though I'm more a disliker.

) weren’t won over by the emotional button pushing (maybe I'm being unfair, lets say the fun aspects of the movie and nostalgic characters etc), the things you might have otherwise disliked are things you now overlook and they do dislike. There could be a number of reasons for that, but in my case it was mainly unStar-Trek-like behaviour (see below). This is the only thing with the name Star Trek that has managed to offend me in that regard. Maybe I have just been lucky so far.
People argue that Penny from "Dr Horrible's Sing-A-Long-Blog" was merely a plot device. …Yet, she's a plot device essential to the story, and much loved.
Basically, some characters who are just 'plot devices' there to serve other characters can work out if they're given enough.
I would submit that a plot device is a jarring one dimensional contrivance only there to achieve an end and so doesn't have the depth to be "much loved" or be an organic part of the narrative. But maybe that's not the official definition.
… imagine if you were addicted to Big Macs. Say the government passed a law regulating the fat content of Big Macs. …
What if the rest of the public were greatly relieved that Big Macs no longer caused weight gain? What if they found the change in flavor to be largely imperceptible?
Wait, you're not suggesting the difference between STXI and TOS is largely imperceptible? No of course not, so that’s the first place your analogy breaks down. By the way, what are these Big Mac fans addicted to if not the flavour (which you say is almost the same)? Fat withdrawl?

Surely they aren't just being picky for no good reason!
Actually the second problem is that the situation with STXI is the exactly opposite of the scenario you suggest. It is of course STXI that is the theatrical equivalent of fast food. The difficulty the minority have is in convincing the majority that too much isn't good for them. That Star Trek shouldn't be considered a Big Mac type brand because while its not usually high drama, it has always had more to offer than that, even in its lesser moments.
That appeasing the hard core Big Mac fanbase is more important than profit consideration?
No, that making a good movie is more important than profit considerations. Though the weird thing is, if they make a good movie, it probably won't be much less profitable!

And you wouldn't have to be subconsciously ashamed of liking it. Win, win!
… many people who really enjoyed NuTrek enjoyed it on a purely superficial level. Others enjoyed the more subtle stuff while some deplored the subtle changes to 'Trek canon'. It's different strokes for different folks.
That subtle stuff was too elusive for me unless your mean all the Easter Bunnies.

One of the less "subtle" changes I noted was that in the AU Star Fleet is now hiring red shirts who would fail biker gang deportment tests. People who are nothing more that undisciplined thugs and bullies. The fact we never see any corrective action shows how little importance it has for TPTB and makes it look like Star Fleet couldn't care less either. Although they shouldn't be in SF in the first place. Such social conventions are form last century not two hence (I would hope). Yes I know they were just more plot devices but there are implications. I just can't imagine such gratuitous violence happening in TOS, partly because of the times and audience I accept.