Just tell them. They will understand your feelings.
you don't it's better to tell them in person
By telling them that, you are helping them to solve the problem. Call the person out and talk him/her quietly and politely.
You tell her I hate you
If you hate them, what difference does it make ? You can be polite and tell them that you feel you have too many differences and don't want to cause arguments. Simply be unavailable and they loose interest. Again, what do you care if you hurt their feelings ?
just tell the guy your sorry and that you dont like him or her but say it nice and tell him that you're still his friend.
You should tell them it is hurting your feelings. And really if they are hurting your feelings, are they really your friends? If they doesn't stop, they are not worth it. Get some real freinds!!!
Talk to them firmly, but fairly.
There's really no way to tell a girl you hate her without hurting her feelings in some shape or form. If you really want to let her know you don't like her, you have to expect hurt feelings, unless she views you in such an indifferent manner, you're almost like stranger to her.
say i like you but i don't want to date you
Tell them that you have herpes, she will understand.
This kind of depends on how you feel about that person as well, if you don't feel anything, try your best to let them down smoothly without hurting their feelings. If you do have feelings for them, tell them that and let it go from there.