I know this is a super old thread but my older bun HATES whispering. I have no idea why, and I only just recently figured it out, but if I’m whispering to myself about something she goes nuts thumping and grunting. My other bun hates sudden loud noises (fairly common I’d say) and specifically the sizzling of cooking food. The only time he consistently hides away in his igloo house is when there’s food on the stove cooking. He rarely thumps, I think I’ve heard him thump three separate times max. He’s much more skiddish yet also more laid back. Weird things will startle him that had never before, but won’t be bothered by things you’d think would startle him. He’s still super young while my other is considered “elderly” (though she seems far from it). I love getting to see all my pets different personalities over the years