[header] How to deal if you think your friends are being mean to you [title] Prepare your thoughts about what you want to say. [step] This can be easier if you have evidence of the mean behavior that you can clearly point out. Make note of specific patterns or recent changes in how your friend acts. 
Try not to make general statements about him or her being " mean ", instead name the behavior that upsets you. It may be helpful to write down your thoughts and edit the list so you know exactly what you need to say.