Non invites guests looking for invites

Anyone else dealing with family who did not make the cute for an invite coming out directly asking where their invite was?? Currently FH’s family members are reaching out asking where their invites are after not even bothering to pick up the phone and speak to him on a regular when we live close and the rest of the family makes a point. One in particular, a cousin (not blood, child of FH’s mother’s bff) whose sister was invited and not her or her other sister. This cousin didn’t even have FH’s number and had to ask other family members for it. She invited us to her recent destination wedding which would have costed over $2k which most of her or her husbands couldn’t afford to go to either. But this particular cousin never shows up to anything we have like birthdays or other important events in our lives but seems to feel entitled to an invitation. If you don’t even had said person number that should tell you that some sort of family connection or not, you’re obviously not that close to warrant an invitation. I would thin people would realize that a wedding can’t be a free for all with invites especially when we’re covering the costs completely ourselves. She even made a point to complain to FH’s mother, her own mother, and her sister who was invited which made the sister reach out to us upset without knowing the full story. Another family member of FH just outright texted him asking where her invite was with about 10 angry emoji faces. We never hear from her ever. Last time we even saw her was like 3 years ago. She rsvp’d to come to our engagement party then never showed up and we haven’t heard from her since (over a year ago). Why it why do people do these kind of things??