Well I knew they beat me, but I just wondered what the "corrected" comparison was, but was told that they didn't keep track of me, since I was DSQ'd for my illegal sail. Is that right? I don't know what the Portsmouth factor would be for a beach umbrella, but is it up to the scorers to enforce class rules in a Portsmouth race?
You would have to be protested by another boat and have a proper hearing to be disqualified.
I think that is a pretty unfriendly thing for them to do. It would probably be a good thing to take a spinnaker correction next time, just so there are no hard feelings. Your umbrella certainly isn't as effective as a proper spinny.