Does not follow, and I disagree strongly. Specifics matter, but that doesn't make the "meat bag" thing untrue.
If everything is true then nothing is. If you want to compare a person to a meat bag, then you also have to compare them to a block of wood, and the sun, and everything else. i.e. you've actually done nothing whatsoever.
/ | \
meat wood ...
/ \ \
human cow ...
As far as I can tell, the point of describing humans as meat is not to make an assessment of worth, but rather to drive home the fragile and temporary nature of humans. I don't know why anyone would object to that.
The fragility angle was obvious in his post, but people clearly just needed to be butthurt over something.