Naya naya paisa

Ok so make me understand why is it a bad thing for one to spend on themselves when they've just started earning and living a life they could only imagine a few months back?

I met a friend after a long time who is not on the same payscale as me and they made it a point to make nasty comments on each one of my purchases. Rather than being happy for me, they were more visibly uncomfortable by the reality that I now can afford a lifestyle I couldn't before.

They constantly brought up their low salary and associated kharche and made me feel bad for spending money on things. In the end, I was made to pay more of the bill because hey, you earn more so you can but I will buy an expensive dish and eat till I'm content but will only give 1/3rd of the bill.

It made me really uncomfortable and I want suggestions on how to deal with this immaturity because I did shit load of mehnat to reach where I am today and then this oldest friend of mine comes and decides to make me feel like I need to now contribute more because I earn so much more.

For context, I do not care for fine dining but this friend does and always wants to try out new places. I haven't actually told them my complete salary because they earn only 30% of it. I really value our friendship because we've been friends since many years now but knowing that this friend otherwise likes to spend money on fine dining but with me, I'm supposed to pay more.

Kia karna chahiye to make them realise that this behaviour is off-putting?