True Left

Both the Steppe blood memory rightists and the aboriginal blood memory False Leftists will mock the Aryan vegetarian diet as "unhealthy", "high carb", "low protein" etc. But these descriptions are only applicable to subhumans. Of course, this does not mean that everyone who does not have Aryan metabolism is non-Aryan, but those who put down the Aryan diet for these reasons definitely are. Among those with non-Aryan metabolism, there are still people who adopt veganism as it is the ethically superior choice, and hence they cannot be called non-Aryan.

Getting to the point, this guy's "do you even lift brah" comment is most likely a reaction to this attitude, and is an attempt to prove vegetarians are aesthetically "superior" by building their physique. This of course is a False Left attitude, as the True Left attitude is to simply reject the Western definition of "superiority" altogether.