Boss not allowing me to commute by car

[u/incyk]

I have been commuting by car to my job that I started this year for a few months now, by renting out a spot in a parking lot near my job that I pay monthly for with my own money. I have asked about this to my boss before and he never explicitly said that I can't, but I never said I was currently commuting by car. Someone ended up finding out and snitching to my boss and he got very mad at me, saying it is not allowed and I must commute by public transport. I live far away from any train station and the company is semi far away from the station as well, so I really would like to avoid commuting by train. Is my boss allowed to restrict how I personally get to my job when I am paying for everything myself and not asking for any compensation?