But the real kicker is the vacation. Some felt that although OP is justified in no longer paying rent and other expenses, he should still cover the vacation for his child since it seems like he can comfortably afford it:

“I’d say pay for the family vacation if family is important to you. Vacations are a luxury, and so is family time with your adult kids. Your generation has significantly better earnings than your children‘s generation. If the point of a family vacation is family time, shouldn’t you want your kids to be able to come? Is it really family time if some of the family gets left behind when you can easily bring them? (Side note, my parents did well financially, and they still pay for my sister and I to join on family vacations because we weren’t as lucky as they were. I’m turning 40 this year. My parents believe the point of family vacations is for us to be together, and we’d be very limited on where we could go and for how long if my sister and I were paying our own way.”

—u/KaliTheBlaze

“I agree here. You’re [not the A-hole] but I do think you need to look at how realistic a two week vacation is for anyone who is just a year out of graduating from any profession. Funding her life should be on her, but if you plan on keeping a relationship with her you really need to rethink how you treat her.”

—u/Good-Manufacturer396

“If OP has been paying $5,000 a month in rent, it is safe to assume he is quite wealthy and I suspect his vacation reflects that. Makes sense to end help around living expenses but if you want your kid on your vacation, you gotta subsidize it for them.”

—u/mastermind42

Source: https://www.buzzfeed.com/shelbyheinrich/dad-child-cut-off-financially