My favourite saying for those situations is noone ever won a game of Dota by giving up.
Yesterday night I finished my 10 heroes with a terribad Terrorblade performance. First time I'd ever played him lol. My team were calling me puta cos I fed Rubick and Lina on our safe lane, but enemies never really fully took advantage of when we were dead. Lina kept calling me squishy, until I got blade mail, then hood of defiance, then black king bar. Then that player shut the fuck up.