1. chriszf wasn't aware of the guest list requirement at the gate

2. No one at Yelp told him of this in response to his inquiries

3. Yelp was provided with a guest list

4. The security guard said "undisclosed security risk", not "not on the list"

5. Everyone except this student got in without a hitch

6. chriszf came to the conclusion that, since the only information Yelp had on her was her name (due to the guest list), that that was why they had barred her.

Fact 6 implies that chriszf did check the guest list (as later confirmed here). I'm just wondering at how, especially in spite of facts 2 and 4, so many people decided that the most logical conclusion was that chriszf is an idiot that is unable to confirm whether a student's name appears on a guest list.