Earlier quoted context omitted.
A Google interviewer definitely shouldn't be doing that. Sounds like you got a bad one.
I've had a different one contact me repeatedly every 6 months like clockwork for the last 5 years. Of the ~10 I've had one that listened to WHY I wasn't immediately interested and factored that into his future communications. The rest of them came off exactly as the parent comment to yours described. edit: to clarify what happens, every 6 months it's a new recruiter, and they always ping me multiple times until I res…
The early part of the recruitment process is basically a process to get possibly qualified candidates to interview. What it's good for: if you ever want try interviewing at Google again, you can get an interview. I wouldn't expect anything more from it than that; it's pretty impersonal. :-)