Your Grammar Nazi

Jessica Valenti, in a superb post at The Nation:

It’s not based on a belief that women are deserving of human rights, but on a very specific set of rules and roles we are expected to adhere by.

It's not possible to "adhere by" anything. "Adhere" means to anchor or attach. When followed the preposition "to" it means to follow, keep, maintain, respect, observe, be true, fulfil, obey.

If you must use the preposition "by," then use the verb "abide," which when followed by "by" means comply.

"Adhere to specific roles."  "Abide by specific rules."  Never "adhere by."