We went to the coast to go swimming, play football and at the end of it do crabbing. My friends weren't really that close to me, we were friends I would say because of other stuff (football, scouts, classes at school etc.) One of them had a younger sister, she was very mean spirited, I think as a result of being bullied. I guess in the social hierarchy I was the lowest of my friendship group, so they would make small jokes at my expense, nothing super mean but definitely not rooted in banter. This sister had been really going for me the whole day because of this and I had ignored it for the most part. She said something very mean to me and I snapped and said something back for the first time, I don't remember what it was I said but it was probably mean too. She decided that taking this half full bucket of water and slamming it over my head so I couldn't see was an appropriate response. When I think back on this moment it surprised me, for two reasons: the first was that it was the first time someone was outright hostile to me, my friends would poke jabs, but they wouldn't hurt me in that manner, even if they probably disliked my presence they were never outright cruel to me. That someone could be so mean to another person with very little prompting really shocked me. The second would be that I didn't do anything in return / that I let her get away with treating me like that for no real reason, it made me realise that I let myself get trod on for a slimmer of a chance of fitting in.