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Mom told me that I shouldn't feel hurt because my cousin has a bad attitude. So mom told me never buy her cards or gifts. I'm sure those of you have had family reunions where you meet your extended family maybe once a year. Is there anyone in your extended family that is like my cousin? She's so rude!
From the sounds of it, your mum doesn't think the cousin is in the right, and there's a high chance the rest of the family aren't too keen on her either.
She sounds like a total bi-atch, and as Motherknowsbest said, she may have adopted the superior attitude from a long time ago.
Perhaps before you learnt social skills, you never said hi to her and that put her nose out of join, so she did the same back. It would be petty, but some people are like this.
Whatever the cause is, I don't think you should go down the route of cutting everyone who's mean to you out off your life, especially for smallish stuff like this. You need to learn to accept that some people can be rude and not let it affect your own behaviour or chase you away, otherwise you are letting it chip away at you (which would be a shame).
Just shrug off your cousin's attitude and next time you meet your dad's family, be polite and smiling and roll your eyes inwardly when they act out. That way your cousin has no more power to affect your feelings. If you can learn to cope with them, you can cope with people you will encounter for the rest of your life
That said, I'm not saying you should try andd be their best friend, just that you should feel you are able to go to family events when you feel like it and shouldn't let them chase you away.