@RedRumTheHorse
Also depending on his age now he may not be retiring early at 55. They still have to pass the bill to put the state pension age up and may increase the early retirement age in the process.
Whilst Op is using the words early retirement, it doesn’t necessarily mean he will claim any pensions when he stops work! If he has significant investments, he can live on those for years, no one can stop him finishing work at 50/55/60, whatever the official retirement age is. He is unlikely to really need the state pension if he has plenty of other funds.
Op, we are now (Late 50s) at the stage of having enough investments to fund us until pensions kick in, but it hasn’t been at the expense of activities, meals out, holidays etc with our DC (now young adults).
Yes, we have had many holidays in our caravan, but mixed with hotels, cottages, trips abroad, including long hauls. We might have BBQs in caravan, but equally we will have meals out, coffee etc. We have always had a balance, and did not save specifically for early retirement.
As others said, life can be short, we know many people who have not made it to 55.
If you are financially independent, then please just arrange things without him. If that eventually signals the end of your marriage then so be it! His reaction to his aunties golden wedding is ridiculous, why is he worried how other people spend their money?