I don't mind people working 12-14hour days. If they're happy doing it so be it. 
I don't understand it and its not for me, but who cares. Where i start to to have a problem with these people is more often than not, they try to push this lifestyle onto other coworkers who prefer to spend their time at home/doing other shit. 
Like, you can stay at the office until 9p.m. but if you honestly believe i will accept a teams-meeting after 5p.m., you can screw right off. And don't whine about it either, because I'm not the one doing too little, you're the one doing "too much".