I assumed from the get-go that this was probably going to be a strange, slightly voyeuristic depictions of men acting not at all like men or even humans in general normally act (because who wants to see regular guys just hanging out and eating? That's boring).
...I guess what I want to say is, I have no idea why people are freaking out about people acting unrealistically in a manga. This is clearly Cute Guys Doing Cute Things genre. Expect weirdoes, getting weirdly excited or emotional over little everyday things, coupled with vague homo-eroticism, just like regular CGDCT.
It is pretty cute, honestly. But as with other vapidly cute slice-of-life entries of this sort, it gets kinda boring pretty quickly ^^;