You would be incorrect. That phrase does not refer to disrupting someone's internal peace; it refers to a state of lawlessness that is considered dangerous. For example, let's say you're repossessing someone's tractor because you loaned them money to purchase the tractor and they defaulted on the loan. When you show up, the farmer is sitting on the tractor with a shotgun. You cannot then repossess the tractor without causing a breach of the peace, so you can no longer privately repossess it.
There's a practical element to this. K-State can do whatever it wants. There's very little (if anything) K-State can do to punish protected (i.e. racist) speech within the bounds of the constitution.
If K-State needs some pretext to boot this guy (or the next guy) off campus or otherwise punish him in any meaningful way, "breach of peace" is as good (and as bad) as any, imo.
No, K-State cannot do just whatever it wants. It's a state university. The state owns it, runs it, allots it money etc. It is a state actor regardless of which way the political winds happen to be blowing. I forgot that part of the Constitution where it said, hey these rights we discussed, nevermind ... they don’t rough ridin' apply if a school has a code of conduct. Being expelled is punishment. The First Amendment prevents state actors from retaliating against individuals for protected speech. It isn't just limited to protection from being jailed.
The whole reason for the code of conduct change is so that students can be removed for similar comments in the future. This is setting up the university to be sued in multiple ways when the next racist bad person like this kid gets kicked out for similar statements/tweets/FB posts. I understand that it wasn't really a joke to him. I understand who he is and the groups he associates with. I also understand that as a grown adult, sometimes you have to just walk on by the trash.
This little punk's comment was horribly insensitive, specifically intended to rile people up, comes at a politically hostile time, and is not worth the time it takes to read.
Yet, here we are anyways.