He’s almost honest:

I went vegan that day and soon learned I was in a minority. Just how much of the U.S. population is vegan is hard to say, with estimates ranging from 1% to 5%. But on average, just one-quarter of us identify as male. And among global vegans, the number of men also remains small.

It appears that many men have not embraced a vegan lifestyle partly because they find it “unmanly.”

Opinion: Why going vegan is a ‘manly’ thing to do (msn.com)

Regarding the last sentence: NO. He says guys are not vegetarian because of sex stereotypes. What malarkey.

I quit vegetarian eating because of serious health problems. In fact, 35% of the few people who pursue vegetarian eating quit because of health problems.

I became vitamin b-12 deficient which is not a minor medical problem. See The Accidental Vegetarian – Coldstreams

Coldstreams