Please remember why people play normals
I'm sure that there are many reasons for people to play a normal match, but I believe there are two main reasons.
For fun - Playing ranked is stressful. Some people don't enjoy being that stressed when playing a game and so they play normals to just have a good time. Yes, winning is often more fun than losing, so you can get upset when you and your teammates are not doing so well, but don't be toxic.
TO LEARN: This is really the main point that I am getting at. Understand that people are trying to get more comfortable with their role or their champions. Sometimes they are trying out new runes, builds, items, combos, sometimes they are practicing csing, jungle paths, sometimes they are trying to improve on their wave management, their map awareness. ...
If you are in normals and you see someone who isn't doing well, don't flame them for it. Don't ping items or runes that they have because they aren't meta. They may not even know what is meta for that champion, or they might just want to try something to see how they like it.
One last thing, .. Yes, some people play normals to troll. This does fall under the "For fun" category, but this obviously isn't an okay way to have fun.
etc because they are cancerous and usually banned in ranked games.