Stupid girls

So I'm single (recently) and I decided to go to church. A guy that I've met before asked if he could take me home, and I said yes. I didn't thought anything bad because I know that just because someone is a gentleman doesn't means that he likes me, he opened the for me and this girls got jealous and were mean to me. They laughed and said he's only opening the door because the door doesn't work. And I thought and they go to church?? Ugh I'm not perfect but that was stupid. I've never did that to my exboyfriend. :/ why do girls do that?