Earlier quoted context omitted.
This happens all the time in the startup world. It's not something you'd see on the tech blogs.
"all the time" in the mind of Shanley Kane, et. al. Disclaimers like these are mainly CYA statements such that the rabid hordes of social justice warriors don't throw Y Combinator under the bus on Pando because of a disgruntled founder looking to capitalize on feels where capitalizing on actual talent or acumen failed.
This isn't a super out there PC statement that is being made. It's simply saying that this is a professional event and the expectation is for the relationships to be kept professional. You know, how it should always be.
That's not tumblr craziness, that is just basic respect and professionalism.