It's also clear as mud how things got from a tussle on Twitter the whole content/participation of which is also pretty fuzzy to a ban from a conference that had no apparent connection. (The conference is in about a week so nothing happened at the conference itself.)
The Linux Foundation did do a code of conduct post thread on Twitter which, among other things, mentions you can violate an event CoC before an event although it's also unclear what that means. I'm sure more than a few of the 10,000 people attending Kubecon have, at some point in their lives, done something to upset someone else on Twitter.