The simple reason to stop eating meat and dairy is that it's a huge contributor to greenhouse gasses, it's the largest contributor to deforestation, and it's something you can decide to do this very instant.

https://en.wikipedia.org/wiki/Environmental_impact_of_meat_production

"Nature is cruel! So let's destroy it all." -you

Also:

"Let me bring up cellulose, for no reason!" -you

"Let me make a large number of factual claims with no evidence" -you

And finally, and most offensively:

"Let me bring the Buddha in to support meat eating, and I will mis-spell his name as Buddtha".