The only thing I could think of for "you should not pick an engage champ if you are afraid to engage" is that if you are playing anything but ranked people could be practicing and you are pretty much letting them know they arent doing well. And that will tilt some people. You could have just given advice as to how to do better engages. And after the first comment, they were probably already pissed so they just didnt want to see anything that you said as helpful. I personally am not that great at league in any form, so i never play ranked, but I LOVE the game. I dont mind losing, I try not to but it happens. If someone offers helpful advice I do everything I can to follow through, but if people make me feel like I am the worst then I usually ignore and do the opposite. just like a lot of people are toxic and hateful, a lot of people are sensitive. Hope this helps.