I'm [29f] worried that my boyfriend [28/m] may be turning in to a jerk.

My boyfriend has a STEM job that for the most part he is very happy with. Through his job he travels frequently and is able to afford nice things such as a couple of sports cars.
When I first met my boyfriend he was a great friend. Polite, humble, maybe even a bit shy. I've noticed over the past several months that he has been saying things that indicate he may be losing touch with his humility.
A few examples of this behavior include:

• eating dinner at a Taco Bell one evening we saw a sign that said "start you're career at Taco Bell today" and he started talking about how pathetic that was.
  
• I used a silly word (can't remember what it was) and said I thought it was funny and I wanted to use the word more frequently. He rolled his eyes and told me he couldn't use that word at his job because he works with mature adults.
  
• one day out of the blue he started talking about how he was considered a professional in his job but that the world does not view people like me as a professional
  
• he frequently talks very badly about people who live in the suburbs, and stay at home SUV driving soccer mom types
  

When he says these sorts of things it makes me feel like he is arrogant and also makes me feel bad about myself. I have talked to him about this a few times and his response is always just "I don't think I'm better than anyone else. Just different".
How much of this is my own insecurity? Am I over reacting?
I'm not sure if this is relevant but I manage a large resort, earn about 65k a year, and evenly split the cost of everything we do (rent, dates, etc). He grew up "middle of nowhere" poor and I grew up "suburban" poor
TL;DR: boyfriend keeps making comments about other's lifestyle and his status/ occupation that make me feel bad about myself and make him sound like a jerk


Source.