How can I stop someone from hurting me when they don't care about my feelings?

It sounds like there is exactly one - neither two nor zero - people that you can control in this situation. You are already aware of this other person's lack of empathy, and you know what it does to you. You can explain what happens to them, using "I" language (for example, "I feel hurt when you do/say _____) or avoid contact with them, if possible.

Distance yourself from them and surround yourself with people who treat you with kindness. If they don't care then they don't deserve to be in your life.

Never swallow part of yourself for somebody's sake... there happiness isn't defined by you being a certain type of way. There the bigot while you get to smile at them and say I am who I am. It's a matter of accepting yourself... if they have an issue, its there issue not yours. Hence Being offended is kaw kaw and further more makes respect a void concept.

You can't control other people's actions. You can't stop them from doing what they're doing, but you can change how you let it affect you. You have to find a way to avoid letting their actions/words from hurting you. Put on emotional armour, and don't let your guard down around this person.

Personally, I would distance myself from that person. Everyone's feelings should be valued and everyone's feelings are relevant. If they don't care about what you're feeling, you should try to avoid those kinds of people. They will only bring you down.

It's hard to not listen to someone who is hurting your feelings. The best thing to do is to remind yourself that he/she is only one person in a world of others that will always have an opinion. At the end of the day - if they are hurting you and don't care, it's their loss (just say "See ya!"). A lot of the time people who are mean to others are looking for a reaction or are lashing out about something that they have going on personally. You deserve better than someone putting you down...always!

you need to cut that person out of your life if they are harmful and negative to your mental health

If someone has no regards for your feelings/emotions, it is simply just toxic to give them the power to hurt you; You should shut that person out of your life. "Happiness is a choice" :) Speaking from personal experience of course..

If this person is someone you are in a relationship with then the best and in a lot of cases the only way is to leave them. Just drop them. You don't need them in your life, and they don't deserve an amazing and awesome human being like you :)

This is always a tricky situation because you do not want to be rude, but you still wish to get the point through. First of all, telling them to stop might work. Simply go up to them, preferably in private at first and ask them politely to stop doing whatever is hurting you. Second, remove them from your life: if they are a so-called "friend', tell your other friends that you do not wish to go to events with that person, nicely explaining the situation. If they are on social media: even easier as you can block and/or mute them. Third method, tell superiors! If they are co-workers, you should go see the boss and nicely explain the situation (if they do not do anything, they aren't doing their job). If they are classmates, see the teacher of the principal. You can always get help from others but remember: the point is not to be rude to them back, it is to get them to stop being rude to you.