First of all, your analogy isn't quite correct, the comparison would be more apt if the socialist were a business owner, presenting a direct contradiction.

Lefties should probably avoid consuming gratuitously, but the Bors comic is being misinterpreted by neoliberals as an attempt to negate hypocrisy completely. In actuality it highlights a common conservative-style rhetoric of discrediting a systemic critique by vaguely pointing at hypocrisy (Funny that liberals are now adopting TPUSA arguments)

I think a more apt comparison would be, a slave abolitionist consumes products created by slave labor, but still advocates for abolition. This abolitionist is hypocritical, yes, but his advocacy is correct and moral. Bad-faith actors attempting to discredit slave abolition by hyper-focusing on his hypocrisy should be discarded like the rubes they are.