The cool thing about brewing is that you can do whatever you want. If you want a 100% crystal 120 beer, go for it. You might need to pitch brett lacto and pedio and give it a year or two to finish, but dont let anyone tell you you cant.
If you hate crystal and all people who use it, well cool. Its your beer, your palate, your opinion. Rock it!
The trick is when we confuse experimental or personal tastes with brewing to style. The conversation usually goes like this. "My IPA has 15% crystal 10." ---- "You dont want to use more than 5%" or "You can't use that much crystal."
How do we know what someone we've never met wants? And what law says they can't? Maybe, typically they dont... or, if you're brewing to style that might...
Anyway, if someone hates crystal thats fine by me. You can still be my friend, so long as you don't use carapils. People who use carapils are evil and should be banned.