He brings up my triggers

I use to be in an emotionally/physically abusive relationship for 2 years living with my ex bf. Yes he was trash. During that time it caused me depression, anxiety, and anger problems. Thanks to my current boyfriend I have overcome most of my problems.

My current boyfriend is honestly amazing but when he wakes up from his naps he can be so cranky. He bitches at me over small things which makes me angry, so yes I bark back, and then he always says "that attitude belongs in *town where I use to live with ex*" "You belong there."

And every time he says that town it triggers me and it makes me sooo angry. I usually end up swearing at him and I feel bad for doing so. I have told him multiple times that even bringing up that town triggers me. He just shakes his head and dismisses it. Today he fully apologized for how he treated me but I still don't believe he understand my trauma. No matter what I say he cannot understand. When I first told him about the abuse I went through he told me it was no big deal and he knows people who have dealt with worst. It really put a knife in my chest.

How do I handle this? He is not a mean person. He loves me. He just cannot understand my past trauma because he has never gone through anything similar.