Does using Google products qualify my relationship with them as an association? In the same way that me buying you a cup of coffee is association?
I realize that I'm suggesting calls that are difficult to make, but my wider contention is that the current status quo, legal and valid as it is, is missing something that we are going to have to address at some point.
Yes. Though they are different associations. They are subject to federal and state laws which don't affect personal transactions.
For example, they are available to the general public so are not allowed to discriminate on the basis of sex, race, and several other protected classes. California and other states place even more restrictions on their ability to discriminate.
On the other hand, you are free to discriminate as you wish. (Though not without risk of criticism; such is free speech.)
There's another difference in your example. Google provides services to the general public. You use their services. However, I do not provide a drinking-coffee service. I don't even like the taste of coffee. There is no reason I need to accept your offer to give me a cup of coffee any more than I need to accept a flyer from someone in the street. But if I were a company which provided coffee consumption services, then I would have less ability to turn you down than I do as a private person.
My wider contention is that we have plenty of historical examples of public/private space which help us understand what's going on. For example, can a company town prevent someone from coming to town to distribute religious materials? Decided in Marsh v. Alabama. Are AOL email addresses "public", so AOL cannot block spammers? Decided in Cyber Promotions v. America Online.
I realize that I'm suggesting calls that are difficult to make, but my wider contention is that the current status quo, legal and valid as it is, is missing something that we are going to have to address at some point.