study... just in lab?

"i'll going back first.. bye.." she said.
"hey, why you come home at this hour??(for record it was 6 pm) isn't you should study? when will you study?" he said..
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the first question is, why people can't leave their lab (for having dinner as an example) and study at somewhere else (library or home) ?
second question is, why should i study in front of everyone??
third question, isn't the same? if you just sit in front of your computer, and play game or just watch some entertainment in your lab.. is it study??
laptop was made for these kind of questions. from anywhere.. anytime... you are possible do your work. isn't it??
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the worst thing is, on those places.. people who more frequently stay at lab (although do nothing) are considered as a work hard student..
so shame..
shame on him..