For the most part, we're all students trying to learn skills and have a nice time. We want as many people to have a nice time as possible.
TL;DR - Everyone should feel welcome. We don't tolerate abuse, from anyone, to anyone. See something or experience something bad? Let a mentor, leader, committee member or staff member know.
As Computer Scientists we want to learn, socialise and have fun, and it's very hard to do those things in an unwelcoming environment.