
and how many martial arts have you mastered?
he was just stating his opinion, which i believe was solicited by the OP.
and i think he makes a valid point - the rMBP is an anomaly as it's surprisingly only half a pound heavier than the MBA and even has a smaller footprint.
while your argument is certainly valid that .5lb is not trivial and might make a difference to some people more than others, there was no reason to be rude and call his advice "crap," twice. he was just teasing you about working out - but congratulations on being a speedy beefcake.
The last time i was able to run a 5 minute mile, laptops hadn't even been invented yet and i'd probably herniate myself rolling your weights around. yet i still found the weight difference between the the 13" MBA and the rMBP to be almost imperceptible. I was sure I wanted the 13"MBA until I picked it up and played with it next to the pro...it's shocking how light the SSD and lack of optical drive can make these machines.
I think that's all he was trying to say.