I think the problem here is people seeing the term 'friend zone' and not looking at the context it's used in.
First of all, it's used by Jimmy Olsen, a teenager. Most teenagers are immature, and wouldn't think twice about saying something stupid that could be perceived as offensive.
Even if you believe it is offensive, anyone who knows anything about Clark Kent knows that he isn't acting nice and meek in order to fuck Lois, he's acting nice and meek to preserve his secret identity (the fact that as Superman, Lois is into him adds another wrinkle, but it proves that you can't really apply a lot of these real-world theories to comics). He also fully accepts being just friends with Lois in this scene. We also know that, in the previous continuity, Lois does really reciprocate Clark's feelings and they end up getting married. Hell, to most fans, Clark has been put in the friend zone by Dan Didio and Geoff Johns and Flashpoint and should be punching his way out like Superboy Prime!
Using a word or phrase in the right context is everything. Reacting like this is almost as ridiculous as when Spike Lee refuses to see a Tarantino movie because he uses 'nigger'. No matter that using that word in a film about slavery makes perfect sense, the word is offensive and must not be used by a white director!
Think before you outrage. Just because a phrase is 'problematic' doesn't mean it can't be used.