Have you noticed how many 4X4s have personalised number plates? So you're rich - get over it.
4X4s use a lot more petrol. There's a limited amount of that and it's going go run out, remember?
Using a lot of petrol causes a lot of carbon emission. This is the cause of global warming, which is already starting to cause huge problems worldwide.
4X4s hog the road - we have lots of narrow lane roads here, and other people driving 4X4s means that you have to spend half your time reversing to find a place to let them pass (they usually expect the other driver to do the reversing).
There are safety issues with 4X4s - you may be safer, but others aren't. Don't other people matter?
Without any appreciable difference to your lifestyle (in a small car you can get to all the same places, believe it or not), you could avoid all of these problems.
You deliberately choose not to do so. What does that say about you? Your children are going to spend their lives in this world too, you know. They can't buy themselves out of the problems you're choosing to contribute to.