My first post so bear with me

Little bit of a rant but I also need some advice.
My fiance and I have been together for 4 years. He proposed last Thursday evening. It was awesome and I'm so super happy! He's a wonderful man and I can't wait to be his wife. This will be my second (and final) marriage and his first-we're both 30.
We wanted to tell our parents in person and waited until Christmas when we went to family gatherings to tell everyone. We're pretty low key so we didn't make a huge deal about it with our families and I wasn't expecting screams of excitement or anything. His family was fine. My family on the other hand, was not. Thank God we told my parents in private. My mother completely humiliated me by saying he was getting the bad end of the deal and I was getting the good end of the deal. She asked if we set a date and when I said no she suggested the same date as my first wedding (which ended very badly). This was all said in a humerous way but there was no humor in it.
Later in the day my sister and I were at our parents visiting with our elderly uncle. I didn't want to announce it in front of everyone and have another embarrassing jab made at me. I wanted to tell them myself but my mother grabbed my hand, flashing the beautiful ring he bought me, and pointed it out to my sister. I was completely shocked that she stole my moment. She then proceeded to ask me when he asked and freaked smooth out when I said Thursday night (2 days before). She threw a fit in front of everyone and huffed out of the room saying why did I bother telling them and I didn't even have to invite them (my parents) to the wedding.
I'm totally stressed out about planning a wedding. My fiance's family on both sides are close-knit and very loving and supportive of each other. My parents have a cruel sense of humor and like to embarrass people, and sorry to say, but lack public manners (not the worst I've seen but still). I'm concerned about how my my parents will behave at our wedding. I've talked to them before about their jokes and behavior in public (out of place as their kid, I know) and it's worse than before. They think they are just being funny. They tell off-color jokes and my mom pries for personal information. Is there a nice way to sit my parents down and talk to them about this before the wedding? I feel terrible even asking this but surely I'm not the first person to deal with this.
Thanks