Why do men do that? 🙄

I've been married to my husband for 6 years and just today he let it slip that his boss trash talks me. His boss lives nearly 5 mins away from us so when we leave early in the am, hes often behind us. Well, this morning he was bright lighting me, on my ass behind me ( I was going the speed limit, daughter in car) he was racing, in a hurry, being an ass. My husband says just pull off an let him by so I dont hear him bitch. Excuse me? I instantly got defensive and asked why he would allow someone to bitch about me or even something as simple as me driving the speed limit. This isnt the first time either. Theres been 2 more occasions that he has trash talked me to his boss. Also his boss likes to trash talk his own wife saying that the only reason he stays with her is because of their kids. So Im assuming, my husband being the shit talker he is, just sits there an talks trash about me with him and it makes me feel so uneasy. My marriage is just that, MY MARRIAGE and I defend my husband anytime someone talks ill towards him. I expected the same in return but today, thinking about it, hes really never defended me. I thought a husband was supposed to defend an protect his wife. Dont get me wrong I can hold my own without help but when Im not around, he should be my voice. I just feel like around anyone else my husband acts like Im some evil dictator that just has him in shackles when thats far from the truth. I tried to talk to him about it and even aggressively told him if they had anything to say to grow a pair and say it to my face but he just doesnt seem to care. I feel like hes 2 faced in a way and its really starting to disgust me to say the least.