Flirt with Other Guys even though I'm Married

I can't stand my family sometimes. The other day at Taco Bell this young man was smiling very big at me and called me beautiful. I am married. My grandma, mom, and sister try to get me to flirt back with guys all the time. They told me to go over to him and flirt back. They say, "flirting with men while married is not a big deal if you don't mean it." I find it to be a huge deal and to be very unloyal. I forgot to mention they said this while my husband was in Taco Bell getting THEM food. They say things like this to me all the time. I tell them stop everytime. When my husband found out about it, he was very hurt because they would encourage it, and he sees them as family. I wish they could just respect my marriage because my husband treats me like a queen. Sorry for the family relationship rant. I just needed to get it out.