How do i stop people from swaying my opinions?

like i'll like a certain youtuber (this is just an example) and if i see a hate comment or something i get kinda offended and then i'll keep remembering it every time i watch them and pick out all the little problems from their video. another example is i looked at the youtube makeup guru forums and people say horrible things and then i keep remembering them while im watching their videos and stop liking them just because a couple people don't like them.. how do i stop this? i let other people's opinions change mine way too much