Trashing another team for fighting 3v5

It's unreal that people still feel the need to trash a team that's fighting 3v5. Every time they got a kill against one of the 3 of us they would always feel the need to type "EZ NOOB, GET REKT, YOU ARE TRASH." Riot seriously needs to do something about games always coming 3v5 and the toxicity levels of people in these games.