Yes it is.

but taking each decision and weighing it against your values.

He also claimed that kids with disabilities should be executed and infanticide should be legal up to the age of 30 days.

Yeah. This is how I live life. I don't create demand for meat. But I'm not vegetarian.

Personally, I find a lot of Peter Singer's arguments to be pretty questionable. As for some of the ones you've mentioned:

For one, killing humans, no matter how humanely the means, is seen by most to be an act of cruelty. I do not want to be killed in my sleep, so why is it okay to assume that animals would be okay with it? While he is a utilitarian and doesn't believe in rights, killing a sentient being seems to me to have much greater negative utility than the positive utility of the enjoyment of eating a chicken.

Also, farming animals for slaughter will always be destructive towards habitats and native species. Even if broiler chickens were kept alive for their natural lifespan of 3-7 years instead of 8 weeks to alleviate any kind of ethical issue with farming them, there is still an opportunity and environmental cost to farming chickens. We could use that land for to cultivate native species and wildlife, or for growing more nutritious and varied crops for people to eat, yet instead we continue to raze the amazon rainforest to make more land for raising farm animals and growing feed. De-densification of farms would only make the demand for farmland even greater than it already is.

Finally, the de-densification of farms would mean a significant increase in the costs of mear production. We'd be pricing lower income groups out of eating meat, while allowing middle- and upper-class folks to carry on consuming animal products as usual. We should not place the burdens of societal progress on the lower class.

But factory farming is completely separate from the scenario of throwing away the entree on the plane.

Absolutely not! It takes a lot of pollution before someone becomes rich

Corporations respond to consumer demand. Don’t buy beef and there won’t be massive deforestation and insane methane emissions. Every dollar you spend on beef is supporting the 1% and the corporations you claim to hate.

I mean, we can both eat less meat and also demand change from the rich, they aren't mutually exclusive. "Because they do it too" isn't a great excuse

Like they do with coffee or tried to do with clothing. Yeah buddy I am going to spend 110 dollars on your fucking hemp sweater that looks like I am off to go get high off gas in a bag later today. I want to spend my all too few dollars on that.

What's it say?

Not quite so simple:

https://thehill.com/opinion/energy-environment/592243-hold-off-for-now-on-feeding-seaweed-to-cows-to-reduce-methane/amp/