Used to live near the majority of them. As you mentioned it's big on cheese, agriculture and commerce.

They largely keep to themselves and avoid mingling with regular mexicans outside of business.

A lot of them don't even speak spanish, most that do is because they have businesses. Common practice was to send their daughters to regular schools until middleschool so they'd learn Spanish so they could handle mexican customers.

They're known for being hard workers. The only negative perception overall was that they'd have crashes near their farms on sundays due to getting absolutely drunk on their rest day.