I live next to the sea , and windsurf alot .
Called out the Lifeboat a few times, helped windsurfers out when in difficulty , been helped out too when i snapped an RRD in half attempting a backie.
Sounds like your mates need to grow up. If you choose to help out for free then good for you . Better than pissing away your entire life away being a looser . As your posting on here you obviously do abit of biking as well .
Find some sensible, adult mates and ditch the pond life . You can still get pissed , not chat up girls, get pissed . The difference is you have chosen something responsible and they are probably jealous , or want to keep you at their level.
Do they not realise there is an outside chance that their little ‘prank’ might have cost someone their life? Unlikely I know , but not impossible.