I think the messages ( from what can be seen which is practically nothing and not in context so hard to judge) are unpleasant and insulting to people of colour, women, Jews, Muslims etc and show a massive lack of judgement, but do these people MEAN what they typed? Almost definitely not. As Spath said there is amongst some groups, often young males, a savage form of banter, where each seeks to be deliberately more vile and unpleasant than the previous message, none of the people mean what they type however, it's literally almost a game. I don't know if this is the case here, nor do I think really it's excusable to banter in this way but I have seen it from essentially otherwise very nice nice, non racist, non sexist people who are just being for want of a better word, immature and stupid. Do they deserve to have their entire future decimated because of this, possibly not, but clearly we need to do something to discourage this savage banter somehow as it's genuinely offensive and indeed probably frightening for some people.