It means that, in the "real world" -- when you have a job or are operating a business, or are requesting donations for your non-profit, or otherwise interacting

It means that, in the "real world" -- when you have a job or are operating a business, or are requesting donations for your non-profit, or otherwise interacting with people on a purely mutually voluntary basis, rather than because you are paying tuition to them and they are obligated to interact with you -- almost nobody cares about coddling your personality quirks and interacting with you in some rules-based circumspect way in order to avoid topics that you find unpleasant, or to otherwise make it easier for you to handle the interaction. (Note that this is an empirical description of how things actually are, not a moral evaluation of how things ought to be. Whether it would be nicer if things were some other way is beside the point.) It therefore behooves you to learn how to deal with unpleasant topics and "mean" people in general in a constructive and adult way while you are at university, rather than creating formalized institutional barriers that create artificial "safe spaces" to shield you from such things, and thus allow you to avoid learning to deal with them.