Nestle (as of last year’s financial returns) owns 20% of L’Oreal (L’Oreal details on last share sale, Nestle statement of its relationship with L’Oreal). They reduced their holdings a couple of years ago (down from 23%) but at 20% they’re still one of the more significant L’Oreal shareholders (though not the largest at L’Oreal).

Maybe stop eating shampoo then. (= They partly own L’Oréal, and by extension all the L’Oréal brands: Garnier, Maybelline, Vichy, Biotherm, etc.)

To your actual point though: A) that depends on which country you live in, given that their products are manufactured differently in each country/region. B) it does also depend on what brand you’re referring to. I find it highly unlikely you dislike EVERYTHING in the Nestle machine. Hot Pockets? Perrier water? Nerds? Smarties??