Oh, absolutely.
Beating it to death is 'overkill' though if your intention was simply to 'make it sorry'.
Tbh, reading this thread it seems like a lot of people don't feel able to pull their punch accurately enough to both make a seagull regret taking your food and not injure it in the process.
I mean, if you're really angry, and you've physically caught it, what's wrong with screaming in it's face then throwing it into the air. It'll be off like a bat out of hell after that.
But at the end of the day, it's a bit of food, not even worth doing the above either but I guess it depends on your anger management skills.