I am horrendously ticklish and my older siblings used to torture me with it. When I was 6 I applied to be on Get Your Own Back so I could gunge my brother for tickling me too much but I got a letter back saying I was too young. Luckily for him by the time I was old enough he’d left for uni so is still ungunged to this day.
I also scream when I’m tickled rather than laugh, which now I think about it was probably something I learned to do to get my siblings told off for tickling me.
Bf tells me he hates being tickled but he’s laughing and crying cause he’s laughing so hard so I’ll always say “why you laughing then if you hate it so much”
There are parenting theories now that you shouldn’t tickle children too much because it disturbs them later in life. When Jimbo gets actual tickles they’re very brief, literally only a second, but tickles are a very good bit of leverage, and when I’m trying to get him to sleep I can still calm him by asking “is it bedtime or is it tickle time”