Rule of thumb: Those who are attacked, have the right to defend. I don't like tieflings. They are hellspawn/abyss spawn. Being created in hell/abyss? You're evil. Died and ended up in hell/abyss? You're evil. Stay extended times in hell/abyss? The plane warps you into an evil being. It's part of how devils can turn demon and vise versa. Not even angels can resist the change forever let alone mortals. Will I go out of my way to kill them? No. Would I put myself in a position to be screwed over by them? Not if I can help it. Whether something is good or bad is relative and circumstantial.

Do tieflings have evil blood? Yes. Are tieflings evil? Depends. Actions speak louder than words and I do mostly trial by trial.

The humanization of races muddled things. If you don't like tieflings then you don't like tieflings. No need for general action unless something happens. Just be on guard and stick with what you like.

If you are concerned about being good you shouldn't kill anything. You might as well give up adventuring. Killing without purpose is chatioc evil. Killing with purpose is lawful good. Everything else is kind of grey. Is the problem being good or is the the problem tieflings?

That's how I see things at least.

Minor spoiler.
The tieflings are not as good as people think, and the druids are nowhere near as bad as people think. The only actual evil one so far in the grove drama is Zevlor. Everyone else is just grey. More info is in datamine topics and videos.