I grew up in a coastal town. My advice, don’t act afraid. Easier said than done I know when you’re not used to being around them but they pick up on fear and normally won’t attack if you’re not bothered. All else fails then yea definitely shout at them.

But most of all NEVER feed them or let them get access to your trash and shame those who do. Those people are idiots who are causing a nuisance. No joke I once saw a seagull knocking on the door of a house on my street with another one looking through the window like a pair of mobsters looking for people who’ve fed them. Then when I got home my car was covered in bird shit.