Maybe they're a ham radio operator ("love and kisses")?
Maybe they're a big Kill Bill fan (Crazy 88s)?
Maybe they think it's a lucky number (Chinese culture)?
There's a million possibilities[1] besides this baseless ad hominem attack in which you're implying they're a neo-nazi. This moral panic over white supremacists supposedly hiding under every bed is really tiring.
EDIT: Given the ambiguity, I do not support the use of the "88" thing at all, yet one cannot detract from the fact that cultural context and localization is a tricky subject. Even as a location thing I was not supporting it anyway as it's a terrible practice, being leaky information-wise.
Maybe they play the piano (88 keys)?
Maybe they're a ham radio operator ("love and kisses")?
Maybe they're a big Kill Bill fan (Crazy 88s)?
Maybe they think it's a lucky number (Chinese culture)?
There's a million possibilities[1] besides this baseless ad hominem attack in which you're implying they're a neo-nazi. This moral panic over white supremacists supposedly hiding under every bed is really tiring.
[1]: https://en.wikipedia.org/wiki/88_(number)