I think they just meant it's uninteresting to them. I know how that feels. I really hate cooking myself. It's just so hard getting regular healthy meals another way

That's what I meant. The "menial" adjective was more describing something that is uninteresting to a person that is either basic and mechanical in the simplest form. As someone who loves good food, I am well aware that good cooking takes skill and effort. The meal made when I get home from a rough day at work and would rather be doing anything else is rarely an example of that.

I made some seasoned rice, a cucumber salad, and some sesame seed encrusted seared Ahi the other day. It was delicious and healthy, but it took 2 hours to put together, eat, and clean up after. That's not something I'm going to have the desire to do every day.

OP was (at worst) saying that cooking is menial. Not a comment about a person, and not a particularly negative descriptor. The person I replied to then indirectly called him lazy and made an insulting bad-faith assumption about how OP spends his time. The reply is pretty clearly an ad hominem.

I did not imply anything about how OP spends their time. I was referring to how I used to spend my time, which is much more clearly implied in that I refer to my own history of bad habits.

The evidence is massive and drastic that the eating habits of the majority of Americans are killing us. Maybe approaching 50 is making me care less about insulting sensitive internet randos than with helping people understand the consequences of poor eating habits and the fairly simple way one can change. Sorry for caring.