what is the best way to tell you rkids its ok to se santa clause

i think a big guy in a red outfit can be scary my son is afrfaid necause he hates facial hair

Kids sometime feel that way and don't think about it as abnormal. Some kids are just like that. Maybe it help if you let here expose little by little but don't be too fast. It help if he see kids that love to come and hug santa. Your kid just afraid of the unknown. Exposure to it gradually will help.