Im thinking its because of this post last month on this subreddit asking why the number was 88 and there were a handful of jokes about him being a nazi in the comments:
(https://www.reddit.com/r/leagueoflegends/comments/176df5w/why_is_jax_hockey_jersey_number_88_important_to/)
image from skin spotlights a month ago:
image of my game today:
86 is even more racist cus it means MORE PURE