My sister-in-law does this to me, fortunately she lives an hour away and I just never have the pattern when we're together so eventually she forgets about it.
But, copyright aside, when people create designs they are entitled to be rewarded for their creativity, and protected against "poachers" for their efforts. It irks me that people put so little value on someone else's accomplishment and their deserved right to reap a benefit from it.
Right up there with kids who expect an inheritance. I tell my son we did not work hard all our lives to leave our money to him - we plan to spend it all!!