You can report the post by hovering over the flag on the right side of the post below the 5 stars. When you go to report it, it will ask you some details.
Really that's all you can do.
I know it's not satisfying to think about, observe, and know that there are people who exist that are rude, hurtful, and otherwise badly behaved, going places such as here to post senseless, ignorant, and foolish material, and not even show their face, but the quicker you learn to grow up and accept that there is nothing you can do about those people, and that it's really not your issue, and learn to ignore those people, the better off you will be.
People like who you describe can't be helped unless they want to be helped. And until that time, they will continue in their foolishness. You have to focus on what's important to you and not let fools distract you. That's my psychology for the day.
Hope this was helpful - LambLamb