I just don't understand it. If I say that I am doing any other workout besides lifting I get my head bit off by this sub. From what I understand, lifting only works out your pecs and triceps. So why should this be my only focus?

I don't have a barbell in my apartment gym (the campus gym is always slammed), but I still workout each muscle. I'll do biceps and triceps and lats and some mixture of others. Obviously I have leg days. And obviously I'm doing core and cardio somewhere in between.

Explain please, why this type of routine is so frowned upon here? I'm asking honestly because it is such a powerful response here typically. To a point where people act like I might as well just be sitting on the couch. Please enlighten me