What is the politically correct term for someone who is not very Internet savvy?
You may also say in a more general sense:
He/she is not a very technical person.
I have heard this used and I think it's specific enough to get the point across, but vague enough that it's not finger-pointing at a persons' deficiencies. It's not specific to the Internet, but these days enough people consider computers and the Internet synonymously that it's still effective.
I hear the phrase "digital divide" on my local progressive radio station quite a lot. It describes a systemic, unfortunate lack of access to high tech without ascribing blame.