"Seagulls" is most definitely open to question, especially in reference to the birds seen gliding around the Amex and on the club badge.
The herring gull is not a true seabird and exists quite happily inland. Maybe if the crest depicted a kittiwake, that would be a start.
"And if you are a Palace fan surrender or you'll die ..."
In reality, more like: if you are a Palace fan, that's interesting, I support Brighton, seen some memorable games against your lot, that Zaha dives a lot doesn't he, good to have the rivalry, ultimately better to support your local club...