Lior: Chicken and cheese is drabbanan – but no kashrus agencies c’v gives hashgacha 🙂 When there is an issur that has two sides, the issur is still forbidden for the machmir – but it loses it’s status to some degree.
Driving a car on Shabbos makes you not Shomer Shabbos.
Opening a bottle of soda does not – even to one who holds its forbidden (insert any of the 1000’s of machlokes haposkim in Hilchos Shabbos which of course is more strict and important to Yiddishkeit than Cholov Yisrael.)
I am on the Cholov Yisrael side. But creating issurim (the giving of cholov stam to a person who is not particular especially in America) needs reasoning.