customAddressAttributes.js

    validator.addRule(
        'customer-type-validation',
        function (value) {
            console.log(value);
            var customerTypeSelector = $('[name=custom_attributes\\[customer_type\\]] option:selected').text();
            console.log(customerTypeSelector);
            if(value === 'hello') {
                return true;
            } else {
                return false;
            }

        }
        ,$.mage.__('Custom Validation message.')
    );