I don't see it as trying to fly under the radar. I see it as 'you demands are so stupid you don't deserve a verbal response'. These sorts of contracts are so lopsided that not getting a verbal response is probably the most polite response they will be getting from me.
If someone can't have a conversation about an employment contract any more politely than "no verbal response" I have to wonder how they ever get hired in the first place.
The "must disclose any existing inventions or ideas to the company now and that anything not enumerated belongs to them" is what does it. Almost none of my offers have ever included such a line. Any company trying to push that does not deserve a respectful response.
I can have a conversation about the contract. But when the contract includes that, it is like being given a serious minimum wage offer.
So then you refuse that contract. If you are saying that the whole process is unserious then you're making a huge mistake since the legal system considers signing a binding contract to be a serious endeavor regardless of how you feel about it.
You think that will fly in court? A contract is an agreement between two parties. If there are provisions in the contract known only to one party that renders it potentially invalid, because the other didn't agree to it.
That's pretty silly. Just strike out the parts you don't agree with if that's how you feel.
Is there a reason why one should quit instead of negotiating the contract while also letting them know you are offended by their initial offer? (Of course, if my current employer pushed something like that on me, I would be starting to look around.)
If anything, quitting is likely worse than being let go because you likely have less of a claim with regards to unemployment (a lawyer would need to specify the actual details).