Interesting that you get grapefruit from Citra. To me they're very "tropical", like mango or passion fruit. Interesting how different people sense the same thing differently.
You are very right about our tasting the same things differently. I can see the mango/passion fruit quality. I'm still learning to calibrate my tasting skills. I pick up the citrus is in the aroma more than the taste. (While others apparently pick up cat urine--yuck)
Part of likes/dislikes is hormonal. When my (then) wife gave birth to our first child, her food likes/dislikes changed. Her hormones had changed due to pregnancy and that changed her tastes. And part of the difference may be aging. I just turned 60 and my taste buds aren't what they used to be
. They need more intensity in flavor than they used to. That change has made it even more imperative that I not drink bland beer. For me, supposedly bitter IPAs taste sweet to me.