If you have lower standards than most, don't expect others to have to lower theirs to your level. If you've been sucker-sold a defective unit and accepted it, that's your choice. Don't turn it into your soapbox justification to berate others.
That's where the problem is. It's not about whether you or he has lower standards – you have nothing whatsoever to do with the standards of the machine or its manufacture. The standards you should concern yourself with are the standards of the output you produce with your Mac.
If your work and concentration can be disrupted or hijacked by miniscule cosmetic "problems" like a slightly slanting key that has absolutely no ill-effect on your projects or personal performance, then you in fact display LOW STANDARDS of both tolerance and focus, allied to an inability to discern what is important in your pursuit of results.