I'm sure I wasn't bothered by Spam until late in the 1990's!
Yeah, as far as it being a pain in the mouse, probably not much earlier...
Until a few years ago I thought spam was a salted meat that you fried or baked and put in sandwiches.
Personally, I don't like either kind.
My mother made some dishes with Spam. Those didn't "bother" me, so I guess the irritation with spam came in the 90's as stated above.