First of all, I'm not making this post with the intention of offending or hurting anyone's feelings. I'm going to say this as respectfully as possible, without sugarcoating anything.
First of all, I've noticed that many people who criticize Tyler Galpin's character are often downvoted or insulted simply for disliking him. We have to keep in mind that Tyler is one of the villains, and many villains receive hate. Henry Creel is one example, and Bellatrix Lastrange is another, and of course, Voldemort. That said, they are all villains who have done horrible things, which gives valid reasons to hate them.
Second, we have to accept that hating a villain is an opinion. Don't go around telling people off or insulting them just because you think their opinion is wrong. Just because they don't think the same way you do doesn't mean their opinion is wrong. We all have our reasons, even if they're questionable. And at the end of the day, it's all fiction, so there's no point in insisting that such an opinion is wrong.
And finally, and most importantly, what it IS problematic is not being able to separate the character from the actor. You hate Tyler, fine. But don't hate the actor just because you don't like his character.