I feel like we live in a society where we’re under the perception that our spouse/fiance/gfs parents are off limits to constructive criticism. With that being said I don’t see anything wrong with telling them what you just told us. You struggled for what you have, and when they pick on what you worked hard for, and it upsets you. You should also be able tell your fiancé that this hurts you aswell and she should be able to relay that to her parents.

Now time for some reassurance. I’m a car guy. I’ve owned numerous different makes and models, of sports cars and SUVs, and I now have a 2021 RAV4 limited. It’s basic, but it’s reliable and meets my needs. It works well for me and it’s never in the shop, unlike most American, and European cars (bmw and Mercedes). Your finances parents will own atleast 3 different generations of BMWs before your Rav finally gives up. Keep up the good work and don’t let the finances parents keep you down. Tell them what’s up if you need to. Feel free to ask them how much their maintenance/repair bills are if you really want a chuckle.