Poor lad, he's just a little boy lost, isn't he? Who knows, maybe it's bravado, after having the stuffing knocked out of him by missing his grades and not getting into his university of choice. He'll work it out eventually.
I speak as an arts student - my lack of subject ability notwithstanding, I'd have found all the labs quite taxing, but I imagine if you're enjoying what you're doing, it's not so bad. A lot of scientists would rather saw their arm off than work their way through the average reading list, let alone then distil it into an essay (not doubting their capability of doing so, just their interest/motivation!) so anyone who can manage a foot in both camps, I doff my cap to.
For me, I would always consider the 'other' discipline harder than my own.
To your question LoniceraJaponica, I think objectively, yes, in terms of attendance in a lecture hall, or in front of a tutor, or, in the inital terms, submitting work, BF will have an easier ride than DD, stuck in labs. Of course, the consequences of being given all that freedom is that he will then criminally underperform in his exams, and risk ending up with an indifferent class of degree, if he doesn't recognise that coasting on his own brilliance has already cost him his first choice university, will he then let it cost him his first choice class of degree?
I feel very sorry for him - it sounds like he has a lot of growing up to do. Hopefully he can do so before his time at uni turns out to have been a waste.