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Comcast likely cares very much if you run a Tor exit. They don't care at all (and probably can't even tell) if you just use the browser bundle.

Someone was likely threatened with disconnection for the former. This is probably the source of the confusion.

Eh?

Yes they can tell if you use TOR. TOR is like a VPN, it can be detected but it doesn't tell the ISP what you are doing while you use it.

They don't know what's going on if you are a user or an intermediate node.

If you are an exit node they see all the traffic in clear.

Sorry, I thought the context was clear. I was talking about an end user as described in the OP.

Yes, if its an exit node that is the case.